Please use /unstuck, if that doesn't help and you're on singleplayer or an admin use /fly to get out. In case you play on a public server, reach out to an admin to get you out.
This works as intended. I don't think we have plans to change this, but as we're introducing a multitude of new blocks some of them likely will work as replacement for what you want to do as well.
We had NA servers a while back but their usage was so low that the high price of servers in the US (about triple the price in the EU) was not worth it, unfortunately. Currently, we have no plans to reintroduce servers outside of the EU. We may do so when we introduce Eco to asia and get asia servers.
Actually a lot of NA people play on the EU official servers with zero issues.
You need to have a solid roof without roof blocks and those on top, the roof blocks itself do not seal the room and hence count as a empty block, reducing tier. This will be fixed in the future.
The holiday changes will be reverted with 9.2. It's not possible to turn it off manually, but once we got a event system in for such events, they will be time-based instead.
As Eco is solely about real players playing together, building a society and collaborate, we have no plans to introduce NPCs to the game. We do plan to improve possibilitites for singleplayers, but the focus is clearly on multiplayer, hence a dedicated singleplayer mode is not planned either.