There is much more but basically over regulation, over taxation and just trying to take over the entire economic engine rather than let competition do its thing.
That concern was addressed at the end of your thread title (a lot of others could be addressed following the same path).
As to tech and how people that use mobile can be so backwards with tech. Actually the reason that they don't know basic computing is due to that very thing, mobile usage.
Think about how much that is abstracted away from the user, the file system (what passes for Windows Explorer, Files, Dolphin whatever one uses) isn't easily apparently to the user (why I like the PinePhone, it is). Saving, in this day and age of web based programs, auto save is all the rage (those that use Google apps on android (which is the de facto standard OS of mobile) are web apps, just using a webview to look like native). Locating files...global search, don't need to know where the file is actually located.
How many people on here don't touch CLI and yet for some computer operations that is still the most efficient way to communicate with a computer. In fact, if I were to suggest something like that, usually there is a pile on. People love their pointy clicky methods, regardless of efficiency. So this slippery slope was a long time coming in the works.
Everything has been progressively dumbed down with each iteration and what is going on behind the scenes isn't being taught (not just in this area of learning, but in other areas as well). The Verge (I still cringe thinking of that YouTube video and custom building PCs) had an article on that very thing where college students didn't know how to work with files and couldn't get their simulations to run at all ( engineering students I believe or at least the class was engineering, how is that for irony).
Working with ones hands and those types jobs, service industry jobs, have been looked down upon for 2 maybe 3 generations now. Even though they used to be able to provide for a family.
As to immigration, wide open borders, illegals being able to vote in local elections (New York I believe, at least that was up for a vote and expected to pass last that I read), D and F grades being removed from school grades in at least one Cali district. None of that, in my mind bodes well.
Drop in birth rates, tends to happen in more developed countries just naturally. But there are other areas that have impacted people's desire to have kids, some not wanting them period, some concerned about the impact of the extra environmental strain on having more people, some don't want to have kids because of how family law is setup (this is country specific). I would say the later is having more and more of an impact. The ultimate reason behind that last aforementioned impact is also the reason that I would suspect is the demographic shift of those attending college as well.