I don't think it's that at all. The real cause is just some entirely institutionalised academics wrote the textbooks and everyone else is copying it rote as if it's the way of doing everything because that's all they know.
You need people from outside the echo chamber. I found The Open University to be a considerably better education provider on that basis than the red brick I attended quite frankly. The material and tuition is far far far better.
Incidentally your point in Khan Academy is spot on. That's basically OU but the material is miles better and it actually leads to a qualification.
Tried it. Nope. You can get people to acknowledge it but because it's not a fun project or doesn't involve an upsell you can bill the clients for, it'll go in a product backlog for a decade or two.
I don't care any more. I'm just there to tell people what's shit and then laugh when it explodes in their face.
Everything I look at these days looks like this. And most of the time it doesn't even solve the initial problem statement but everyone is too naive to even realise that.
The worst thing I've seen is a stack that parses out a file and loads it into a DB. So someone sends us a file via an expensive SFTP+S3 thing in AWS. That is then picked up by some scheduled task using a proprietary in house scheduler process running inside kubernetes. This proceeds to download the file to the local pod. Then it makes tens of thousands of API calls to match up data which cranks the CPU up on a huge database server. This breaks all the other jobs running. Then it writes another file out to S3, consuming 17GB of RAM in the process. Another process picks that up and then batches it and inserts it into the DB with no transactional stuff around it.
The original process this replaced was a copy into a temporary table and then a bit of transaction-wrapped SQL that took about 20 seconds to import + run. They improved that to 7 hours and reduced the success rate from 100% to about 80%
HP are scum but I have to say the most reliable laser I've had is an HP LaserJet Pro M148 and it wasn't expensive. No jams, everything works, no crapware. Done 7000 sheets on it. The only thing you have to do is ignore the low toner warning as it'll do a few hundred pages after that kicks off.
This is a vast contrast to the cheap inkjet I got from them before which was drop kicked all the way to the trash after it died replacing the first cartridge.
I had a Brother laser before them and the thing used to jam all the time and ate drums.