There's one specific problem with tech hiring that generally doesn't get a mention and maybe should: HR hiring staff apparently has a really high rate of turnover, especially among contract sourcers and recruiters (and it seems like many of these people are contractors).

One really easy way to get ghosted during the recruiting process is if your primary handler quits, gets fired, or just doesn't get their contract renewed.

I don't think this is the primary problem with tech hiring, but it might be a quite significant secondary problem.