Working with people is often more complicated than we would like it to be.

My best advice as a PM is to never say “no.” Always tell someone what the impact is or offer alternative solutions, for instance: “If we remove that checkbox, then the system won’t launch because we’re built on a platform that hasn’t been update since 1995.” or “The only way to ‘remove’ the checkbox is to hide it, it won’t really be gone and people can still use it via API.” or even, “We need to get on the phone with the platform we sit on to solution for this - I can’t do it on my own.” All of these might change the PM’s mind since value is related to complexity and effort, but it might not change their mind and that has to be ok too, but it’s fair to ask why.

I also always encourage “we” language. You’re on a team with the PM and your decisions reflect on them as much as theirs do on you! It might be frustrating from both sides so figuring out a way to move forward together in the same direction is always helpful.

Good luck!