You have to understand that when you are in takeoff profile, you are only just barely above the stall speed. If you induce a large amount of drag, then your airspeed could just likely (and IRL probably will) drop into the stall range, and then you are in trouble right away. When you wait until you have established a good rate of climb and air speed, it will be safer to raise the gear. There have been several comments from others who have used the aircraft in-sim, and they have said that this drag is not modelled, so you need not worry about it - I guess. Shame, because it takes some of the reality away from performance. You could assume, if you want realism, that it is modelled and make your takeoff accordingly, as if you are IRL. Then you would be one step ahead of those who do not bother to achieve accurate performance.
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