You can’t rely on running alone. You will have to go through security again in your layover city. This could be the long pole in the tent and is essentially out of your control
There are no security checks within Schengen. Agree with your other points though.
Mastodon is a more mature software so they probably had more time to work on extra features like cross-platform federation.
You would think so, but afaik Mastodon hasn't made any changes to federation in years. Which means it is left to other projects like Lemmy to reverse engineer whatever Mastodon is doing and implement that, no matter what the standards say.
I think Lemmy is attractive enough, but that only matters when people actually want to join something new. Thats currently not the case, so for better or for worse we have to wait for another wave.
I am planning to implement private communities soon, hopefully it can help with that. Then maybe Lemmy can become an alternative for Discord and other platforms too.
I don't have time to respond everything, but just about the growth part: Before the Reddit blackout happened, Lemmy was stuck with around 1000 monthly users for at least a year. It was quite boring compared to now, in 15 or 30 minutes you could read all new posts and comments for a day. It was also easy to recognize the handful of regular posters (cheers). At that time you could easily think the same, that Lemmy will never grow and people will leave. But then the Reddit migration happened and we got completely overwhelmed with a 70x increase in active users.
It seems to me that growth on the internet always happens with short spurts and long quiet periods. There will probably be a time when people come to Lemmy again and we reach hundreds of thousands or millions of active users. Then we will fondly remember the time when it was so small.
Votes are needed to sort the posts and decide which ones are shown at the top of your frontpage. If we add different reaction types, it's not at all clear how each of them should affect the score. We might come up with some arbitrary numbers, but then the system will get a lot less intuitive and more complex.
With crypto you can make international transfers within a few minutes and only pay a few cents. Using a bank account it takes multiple days, and costs a few euros at least. For me that's a major use case and something I do regularly.
Dont forget 4: Lemmy was created by a German (me)