Is timeliness no longer valued at all?

I'll preface this by saying I'm 29, so by no stretch am I on the older side or anything like that. Has anyone noticed how hard it is to get people to be on time? My parents were always super on time people and instilled that in us. My dad was definitely a "if you're not 15 minutes early you're late" type of person and that has been beat into my brain my entire life. I get legitimately anxious if I think I'm going to be late to something, even something non-critical like going to a baseball or football game let alone something like a work meeting or something else.

It feels like pulling teeth to do anything where my peers are on time now and a lot of our employees fresh out of college seem to have constant tardiness issues. I also feel like people barely want to commit to anything. Whenever I get invited to something or my fiancé and I know we want to do something, we plan it, get it on the calendar, then show up on time. A lot of times if we want to invite our friends, they'll never commit and will only decide last minute if they want to come or not.

Is this a generational thing, have people always been like this? I guess I just find myself infuriated that people can barely seem to do basic planning or show up on time for things.

/rant

ETA: I'll add the anecdote that precipitated this. Fiancé has a friend struggling to find a job. I have a childhood neighbor my parents are great friends with who is a massive figure in international law. State department connections, judicial connections, managing partner at a massive international law firm. This is right in this girls wheelhouse for what she wants to do. We set up a dinner at my house (which we were going to travel into town for) so they can meet. Well she cancels the day of because she made casual dinner plans with another friend instead. Totally bails, but says she'd like to still do a zoom meeting with the connection. Me and my dad basically just say "not happening, you blew it". My mom has a huge 10 person dinner she's been cooking all day for this as we were coming in, the lawyer and his wife, plus others, now will basically totally go to waste.

Just all around so infuriating that people are so flaky and irresponsible, even for things like this which would have massively been in her own self interest to make it there.