That said, as a non-US person I'm not personally on-board with .com-for-everything, but I understand that Joe Public in the USA thinks differently.
Generally, I'm not sure. But I (and I think the majority of the people I know) were beyond that stage a long time ago or never cared/understood to start with. As you mention, not being in the US might bias my opinions and the opinions I'm exposed to on the matter, so YMMV.
I'm not sure if it confers any SEO advantage, but I don't particularly care about that (the things I have hosted are only useful to people who already know about them, so SEO isn't a concern).
> trustworthy
That might be the wrong concept for the discussion though. Another key factor is whether somthine.com is more memorable or guessable than something.co.uk, something.site, something.link, ...
I think, as a start, any domain is fine but when you have gone big, you should acquire dotcom.