I don’t think you understand what trim really is and what is meant by “relieving pressure“. You don’t need a force feedback stick to feel pressure. What it’s means by releasing the pressure is the forward or back pressure that you are having to apply to your yoke or stick in order to fly level, climb, or descend. Once a plane is properly trimmed, I can climb, fly level, or descend without having to put any back pressure or forward pressure on yoke or stick. The plane will climb or descend by itself with yoke or stick centered and the pilot not having to push forward or backward. The pilot only had to apply the Forward or back pressure to the stick initially to begin the climb or descent. Once a steady climb or descent rate is achieved. You then trim the plane until you no longer have to apply any forward or back pressure to the stick.
Even for level flight, depending on how much throttle you have set, sometimes you have to apply forward or back pressure on the stick just to maintain level flight and to keep the plane from climbing or descending. For example, let’s say I have my throttle set fairly high around 100%, but I don’t want the plane to climb. I just want to go really fast. In real life and in the sim, if i don’t set my trim properly, I will need to constantly push my yoke or stick forward to keep my plane from climbing. But instead I can use my elevator trim to trim down until I no longer have to push my yoke/stick forward to maintain level flight.
That’s what the pressure is. The yoke/stick is not pushing against your hands. You are having to apply pressure to your yoke/stick to keep your plane from climbing at your current throttle setting. In the scenario I described with 100% power, if you want to fly level and not climb, you have 3 choices. Give the plane less throttle or constantly push your stock forward or trim down until you no longer have to push your stick forward.
Same thing applies when climbing or descending. If during takeoff at max throttle, let’s say that I want to climb out at 75 mph and a 15 degrees angle. If during my 75 mph 15 degree climb, I am having to pull back on my yoke i.e. apply back pressure, instead I will trim up until I no longer have to apply any back stick pressure and the plane climbs out at 75 mph and 15 degrees all on its own with my stick/yoke centered and with no back-pressure.
Same thing when descending. Let’s say I want to descend. Normally I would throttle back to about 50%, until I achieved a 500 foot/minute descent rate. But throttling back would also slow down my forward speed. So let’s say I’m running late and I want to keep cruising fast and descending. So instead of throttling back as much, I stay at 75% throttle. At 75% throttle the plane will not descend on its own. It will want to keep flying level. So in order to begin my descent at 75% throttle, I have to push forward fairly hard on the yoke (forward pressure) until I am in a nice slow 500 foot per minute descent. But let’s say that I’m descending from 30K feet down to 2K and I really don’t want to have to hold forward pressure on my stick for all that time. So I trim down until I no longer have to press forward on my stick/yoke any more. I’m still at 75% throttle, and I’m still descending at 500 feet per minute, but my yoke is centered with no forward pressure required because I’ve trimmed perfectly for my 500 ft/min descent.
Now let’s say that I see that I’m running a little low on fuel, so I throttle back to 50%. If I don’t change my trim, I will start descending much faster. I see that I’m now descending at 1,000 feet/min now and my wife is getting uncomfortable. So I have to apply back pressure on my yoke to slow my descent rate. But again I don’t want to have to apply back pressure the whole way down, so I trim up until I no longer need to apply any back pressure to my yoke.
It’s very important when using trim, that you never want to control the plan with your trim tabs. For example, if I wanted to, I could let go of the stick and just use my trim tabs to steer my plane up and down or left and right if I have rudder and/or aileron trim tabs. But let’s stick to elevators trim tabs. In the scenarios I described, I always first used my yoke/stick to achieve the flight condition that I want: Level, up, or down, once I am flying level or descending or climbing at the rate that I want, by applying forward or back pressure to my stick/yoke. Then I use my trim to relieve that forward or back pressure that I was having to apply to my yoke, not the other way around.
Using trim is a very important aspect of a flying. MSFS is intended to be a flight simulator not a flying video game. Some planes do have Auto-trim, but it’s very uncommon. I recommend that you just learn how to use trim properly. When you get it right, it will make flying a lot easier, less work, and more enjoyable, not the other way around.