TL;DR
titleWhat?
instead of replacing the icons with the icon in the hand (like infinity filters, logistic requests, etc.) it should behave like the research queue aka inserting what you have in the hand. if you are like me, you like structuring things (like the infinity filters). if you then want to add a new tech level you now need to constantly pick up the tile and move it one tile "forward" to keep the order while inserting one icon.i guess one way to kinda prevent that is by making the infinity filters behave like the logistic requests.
now one problem that i think might be a killer is what happens in a constant combinator or logi group that uses empty tiles as separator. well, there you would then only need to move one tile to the end and everything moves back. (or maybe even letting us "clear" a clear icon tile with right click, so that it gets deleted?)