I know the post is a few days old. But I just have to reply.
I really like what our devs did! It’s a beautiful solution to the question “how to spread repair pack all over the base”
Of cause with updates things are changing.
-You no longer have to put repair packs to roboports!- Just leave them in ...

From my point of view underground belts and inserters work as they should work. Inserters should not be able to drop items in graps which are too small for an item. What worked before was a bug (in my opinion). (only we're used to abuse this exploid it's not a feature)

So what we are suppost to do ...