Indeed. In game, if you don’t simulate extra pasengers, weight, etc and always take off with the same fuel load, settings, etc, it matters little. Once you get to know your plane, you always know what your default Vr, Vx, Vy and Vg speeds are.
That said, it’s nice to have a couple of them on the tape. Even if you know the values, it’s nice to be able to quickly glance and to see if you’re on a marker or not without having to read the tape. It’s a handy quick reference. I typically keep my Vr and Vg on there.
And here’s a tip: If you use the G1000 mod, once you set your REF speeds to show on your airspeed tape (setting them to ON in the REFS menu on your PFD), next time you’re in that plane, all you need to do is hit the REFS soft key, and it will add them back to your airspeed indicator. You won’t have to scroll in with the wheel and set them all to ON again. It’s a nice little time saving touch.