People who work on and dedicate time to the project such will naturally get defensive and frustrated when they encounter someone saying what you said. No, you're not banned, you're just expressing your frustration, which is perfectly understandable. We haven't added the features back as fast as we like, I admit, though I would ask you to try understand the situation a bit.
To answer that exact question, "why bother if it doesn't have all the features as the original yet"? The answer to that question is quite clearly because people can use it, do use it, and it's usable enough state for many people that it warranted letting people use it. Mac had pretty much nothing. Why would I deny them an opportunity to at least stream their games? If people can capture their games and make basic broadcasts, and now are slowly getting access to more things such as the browser plugin, so why on earth would we say something like "no, you can't use it, we haven't added chroma key yet", or "no, we haven't added hotkeys yet, you can't use it!" to them? I can't help but to feel that would be quite preposterous, and unfair.
I did indeed have to take time to work on the windows side of things for it, but that doesn't mean that mac is 'lower priority' by any means. If I "didn't care" about mac users, why on earth would I even have made the effort to make a working mac version in the first place for people to use? Any time I work on any feature, it delays some other feature. It's completely unavoidable and the only thing I can really do is try to schedule what I should work on next to the best of my ability. I'm not happy with it but it's just the way things are.
As for those missing features, we are putting all those features back in, slowly but surely. Cropping, chroma key, more plugins, better UI, filters, and many more things down the line. You have to understand that this is not a trivial program, and we now support not just one but three operating systems, so it's been a lot of toil to get it back to this point because there was so much operating-system specific code related to efficient capture methods.
Couple all this with bugs and/or design flaws that can and will inevitably crop up on occasion, and it can be a lot of work.
I understand you're frustrated, it's perfectly understandable, I'm frustrated too, I wish I could clone myself (and palana) a couple dozen times just to get it back to parity faster, but I only have two hands, I am a human being and can only do so much per day (which occasionally includes writing unnecessarily long forum posts apparently).
We are not some sort of perfect all-knowing, all-understanding, all-powerful organization, we're just a bunch of human beings, subject to flaws, we're people who love this community, and enjoy making these tools.