It's impressive that so many people can be dedicated to an unpaid project and produce something so professional in design. They deserve that much. My main problem with it is that they are saving mod support for the end of development which is basically game dev language for it probably won't be good and in that case brickadia will fail to surpass blockland. The fact that mod support isn't a first priority means that they're making a building game, not a sandbox game/mod engine (pretty much what they said) and in that case it's probably gonna be boring as forget.
Hopefully they realize that mod support really needs to be made and needs to be made before all else in order to save them time and money. If they don't, well, that's jjst a loss
While I think you raise some valid concerns here, remember that blockland went through a very similar phase in relation to modding support. It spent several years in alpha with very little modding support, and then once v7 was released, addon packaging was completely revamped to accomodate the new mechanics in the game as well as streamline mod downloading and whatnot.
Brickadia is in a similar situation now where many of its planned core features are not implemented yet, so adding mod support would be pointless as it'd have to be fundamentally redone every time a new update would come out, which would slow down development even further. I'd rather they finish the core features of the game and then implement modding support, once all the core features are in that modding would
need to have to actually be fun.