If you're going to create a page, maybe give it some content past the info box. Otherwise it's pointless and you just wanted to create a page and not put effort into it. If you do plan on adding to it (which is advised), that's good. But otherwise, I suggest you don't create anymore pages that automatically become stubs.
Unsure what you're referring to. All of the articles I've put it in have contained spoilers. I haven't particuarly been on any non-Endgame-related articles so I doubt I put it by mistake. But which raised concern?
Yes, it is wrong. No spoilers means no Spilers template. It doesn't matter if some upcoming MCU product will be released in two minutes, two hours, two days, two weeks, etc. If there are no spoilers from that upcoming MCU product in the article the Spoilers template doesn't belong in it.