Maybe they can still be bought online, but whenever I walked into a toy store these past years, all the sets have a theme and a 'prescribed' thing that you are meant to build.
I just want to buy a bucket of parts for my kids to sort out what to build on their own. It somehow feels really restrictive nowadays.
I understand they are probably making a lot of money with film royalties and star wars themed stuff etc. but it definitely feels like a downgrade.