Whatever you believe about whatever object, the problem is we don't all agree. One solitary canister doesn't junk up a summit. Neither does one symbol painted on a rock. Or just one prayer flag. The problem is that everyone's being OK with one thing turns into MANY things and eventually it looks like <BLEEP>. Lots of prayer flags, multiple canisters, graffiti and eventually trash as more and more people see the mess and have less respect for the area and feel entitled to do what they want. The more popular the area, the more out of control it gets.
Did anyone watch the video on here about the kid from VT who climbed Everest? The summit looked like a bunch of people sitting in the town landfill. And that is supposed to be about the holiest of holy mountains. To simultaneously talk about the reverence and respect you have for a summit and also have no problem leaving all your crap laying around there once it's served it's purpose seems pretty absurd. I find that horrifying and massively detracts from that experience.
I'm a big fan of nothing. I like the wilderness being wilderness, not a local park near my house. There are lots of things out in the woods whose value can be validly argued, like the AMC huts, bridges, etc. but I'd prefer to see none of those things. Other than basic trail signs and blazes I really don't want to see anything else.