We have removed them from the two jobsite saws we have. We cut (almost exculsively) 1" and 1-1/4" aluminum angle ,with a lot of miters,trim cuts etc. We have found the scrap builds up catches the blade and flings the scrap/breaks the blade teeth/ or the plastic insert. So yes those get removed in our case. A quick/temporary solution would be to hang a piece of leather,canvas, etc from the tube rail on your saw stand ,it would keep the dust towards the back/shielding your legs and parts from harm .Our saws are equipped on the jobsite with the
FastCap Original Saw Hood. We have their mobile stands/wings as well. Dust collection/schrapnel collection is excellent. I just keep a cardboard box at the bottom of the funnel and empty as needed. This might be overkill for a homeowner but on a large jobsite I'll cut 1000's of feet of aluminum ,making this very practical.