I can't say this has been my experience at all. It can vary depending on the model, but certainly most modern BMW's feel very high quality, particularly the 5 and 7 Series. I had a brand new 3 Series as a courtesy car recently and it felt superbly constructed, absolutely solid. A Skoda isn't going to realistically be better (not that there's anything wrong with it). They have that typical Golf style interior which is pretty standard really - I've never been a fan.
I've driven pretty much everything in-between, including a Lexus LC500, which felt very well put together, perhaps a bit better than my 8 Series was, but there wasn't much in it.
I get that it comes down to personal experiences though, people always say Audi have the best interiors - some of them may look nice, but they fall well short of BMW for me in terms of actual quality, ergonomics, etc. I compared the A6 to my current 5 Series and it was nowhere near as good (and I actually wanted to buy it, just to have a change).
Perhaps my biggest disappointment ever was the Jaguar XF (2018~) - I couldn't believe how average the interior was, yet the press all kept saying how great it is.