You’ve got to accept the fact they want to collect feedback from other users first and not you.
From some users first, even if that doesn't include you
No, specifically him. I’ve heard talk. I dunno what he did but he should apologize already.
Extremely featureful debuggers such as this one tend to require a great deal of code that is hardware-specific, in addition to being OS-specific. I assume MacOS was targeted first because it's the platform with the greatest degree of hardware uniformity. I fully expect Linux support to materialize someday, but with the caveat that I expect it will only (officially) work with the most popular hardware.
That's right. The only way to have a performant recording is to capture the browser's OS system calls in the recording. This unfortunately makes the feature quite OS specific.
Replay is currently in the user-research validation phase. We care about cross platform support and will prioritize it when we are ready to commit to the feature.