People have complained about things getting worse literally for millennia
Either 2000 years ago life was great, or people saying "things were better" tend to be wrong
https://historyhustle.com/2500-years-of-people-complaining-a...
Things are different, people want different things today then they did in the 80s. The top lego sets of the 80s were bought by rich parents for their kids. Adults didn't buy lego for themselves.
Today they're bought by rich adults for themselves, who want different things
Meanwhile kids aren't as bored. In the early 90s as a 10 year old I used to watch soap operas with my parents, because there wasn't much more to do at 8pm on a wet december evening. That was evidenced by Coronation street getting 17 million viewers, well over 1 in 4 people in the country.
Today the same program gets 2 million viewers, nearer to 1 in 40.
That's not because it's materially worse, but because there's more things to do.
Lego has the same issue. In the 80s as a kid there was little to do at home, so things like lego, meccano, spirograph took up the time. Today there's a lot more to do.
There's a reason 80s lego sets aren't as popular as they were in the 80s - the actual sets - and it's clearly not the quality (as a lego 80s set is the same today as it was 40 years ago).