I complained to the guys at PTC LIVE GLOBAL 2015. I am often making band-aids for such features. Just this week I had a weldment that I put a square o-ring groove into, It sure would have been nice to put a round in each of the grooves. I got lazy and did not want to create all the surfaces and solidify them.....I just put a note on the drawing and grumbled to my cube mate something nice about PTC.
It seems I agree with all here in that we should be able to add material (welds) and make simple things like chamfers and rounds at the assy level. Honestly, why not have access to ALL the modeling features, and then if we make something that can't be manufactured, well, that's on us as it always is here in the real world.
Our spacecraft uses composites (carbon fiber), and there are times 2 parts are joined at assembly with additional layers of C/F, and these can be very complex shapes. Also, sometimes after adding this extra material at assembly, a final finishing cut is done on the assy as a whole, to get the desired aero shape. How are we supposed to do that easily if we can't freely add or subtract material????
Ok, if it needs to be a little more $$ in the "Advanced Assy" option, we're willing to pay it.. you listening PTC?