>>338674754
I do this all the time, I'll optimise to a point to aim for optimisation, not to aim for a rating. The rating system is flawed but something to aim for for the inexperienced but I don't care to get a higher rating, just care to optimise.
Decimating is a pretty destructive thing and can fuck up the model badly. The only way around it is learning to redo topology which still results in a lot of quality loss but is also hard to learn. We're not 3D modellers, we just want to have fun in a video game and personalise ourselves a bit.