Developers will develop so it is right for the majority of their users and I guess they are aiming at 1080p which is mid-range at the moment. This is why hardware stats are important. If they’re anonymous then what’s the problem with them?
Your English is fine.
The problem with that is if only a few people have 720p then the majority suffer for no real reason. The only way to know for sure is hardware surveys. That said, Linux is known for running on older hardware so maybe it should be taken into consideration. The only way to know for sure is hardware surveys, everything else is assumption.
If, like KDE’s, they are opt in, anonymous, allow you to choose how much information to share, and can’t track an individual over time then I think they are a positive and an easy way to contribute back to a project. If they are like the Manjaro proposal, which is none of those things, then they are a negative and should be opted out of.