how to get rid of stickers and borders

You can’t ¯_(ツ)_/¯

I don't mind them, but it would be nice to have an option to either remove them or hide them for the people that do want to do that.

I may put in a ticket with an itemized list of removal to see if that works. I have other trash I was rewarded (coupons, free passes, etc) that is starting to add up.

I've seen a lot of threads on the Steam discussion groups in the past week asking for the ability to get rid of unmarketable / untradeable items.

Maybe they'll gather "steam", but most likely they'll be ignored like all the discussions about selecting your badge level to display and other trivial, yet reasonable, UI requests.

Contact Steam support, in your ticket write the exact name of every item you want to remove. I did it a couple years ago and it worked.