Server transfers should be free (at least in language diverse regions) + servers need language tags

No free transfers, yes language tagging as a suggestion for the players.

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I would assume a lot of stuff wouldn't transfer. Gear that requires unlocks not available on the server is another. Freehold placement, node citizenship, reputation, possibly even most of your mounts due to the stable system. I don't see a problem with it if it's strict in minimizing stuff not possible on the server transfering over. I would probably also only allow it once in a life time

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And server transfer w/o loss of property/gear/resources/money would bring imbalance to the new server.

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At the point where you might need a transfer, the leveling process will most likely be way shorter than the currently projected one, while getting new gear/property/etc (of the same quality), on a new server where you don't know anyone, would take you way longer.

But starting a new character and integrating into the server's community from the very start would not only flow smoother, but would also let other people to know you better.

That's a good point actually. I feel really bad for anyone who's claiming their name registration on a particular server, only to find out later that nobody with their language joined it at launch. It's hard to research that in advance, and if your name is taken elsewhere, you can't even transfer. Language tags are a must.