Ditto! Visible tabs should be avoided at all cost.

[nitpick]
For that matter, even "invisible" features like this sometimes bug me. Like the white spaces on the Maiden deck plans, which make it just that little bit harder to kitbash. Also makes it more obvious if something is not 100% perfectly aligned...
[/nitpick]

Though I should mention that this is a minor problem, but it pops into my head every time I do a building with CWU. (And I want to mention it before the release of Himmeltwitch.)

The Auld Grump *TWITCH!*

I'm in the same camp, here.

I feel that visible tabs break the feeling of immersion.

First Light (among others) has the wall tabs going in between the next wall section, which looks great once done (though it's a pain to do quickly with superglue).

CaveWorks has the floor tabs under the floor. Why can't the same be done for Rezolution?

Actually, it's a vocal reaction and in real life it sounds more like this: