Each step reduces the amount of users who could use the feature. If they think this feature is important, it makes sense to include it with the browser.
I'd argue that fact checking can be more important today than anything that you've mentioned. Modern problems require modern solutions and it's natural that browsers extend their feature sets. I'd agree with you had they announced that they were planning to merge Firefox and Thunderbird.
It's nice to have everything in one place, but that's not a complete guide. For instance, you mention Jellyfin and Plex, but from this text it's impossible to figure out how they work, what's the difference between these two and what should I choose. If you add a bit more context, it'll be a great material!
It was a great place to share information in a short and clear manner. You could subscribe to journalists working in your area, a professor from MIT or another university, follow sport journalists, war analysts - you name it. They all posted their thoughts and links to their articles, interviews or podcasts with them, they shared information about their new books. Twitter was like an RSS feed, where you could subscribe to authors directly. You could write them and get a reply! It was and probably still is a great tool, though Musk is taking a lot of steps to destroy it.
We shouldn’t get bullied into believing people can be any sex they want to be.
Does it work like that? From my understanding, a lot of biological and psychological factors play a role. I've listened to a couple of lectures about that, I was surprised how complex it is. I'd expect from someone in his position to be more educated on the topic. But he probably doesn't care. For him trans people is just a safe enemy to create and to attack. Too many politicians on the West follow Putin's and Orban's steps. That's worrying.
Lemmy obviously has some problems. If the OP doesn't want to deal with them and be here, it's their decision. Directly or indirectly, I don't see why would you want to argue with them.
Each step reduces the amount of users who could use the feature. If they think this feature is important, it makes sense to include it with the browser.