Are Glastonbury post-ticket sale threads usually this long every year? I'd be surprised if the same topics aren't regurgitated every time in recent years given people are upset they didn't get a ticket and want to vent.
Ultimately the festival does exactly what it needs to and sells out in no time at all. It's great for the festival and maintains an air of 'exclusivity' which is brilliant for their branding. Remember that being billed as the hottest UK festival is a huge pull for artists also with all other things being equal. GF would not change a winning formula unless there were dire consequences which, let's be honest, there aren't. The crowd has not significantly "changed since a decade ago", you're just getting old. Try going to Leeds festival and get bottle missiles chucked around and see if you still think that.
People will complain every year without fail and do so. If it's not one thing it's another. In the 2020's though, everyone is now wise to tactics with some working better than others. It's a game of chance and if you don't maximise that chance then you're likely to miss out - simple.
The same people whinging about 'unfair' tech hacks are the ones who would leverage every opportunity they could to get a ticket on sale day. This very forum gave me most of the information I needed in recent years to grab tickets via advice on how the load balancing and refresh limiting worked on SeeTickets' site. The problem (if you even want to call it that) is information spreads extremely quickly due to social media and sites like this and people will try anything to grab an elusive ticket.
Ultimately you win some / you lose some and you're not owed anything. If you want to keep chances of getting a ticket high you need to be on the ball with the tech (understand how the website works) and social side (have a big syndicate trying). It's no different than any other scenario where demand outstrips supply up to 10/1. If you want the prize you have to play the game. The fun part is that the game is changing 😉