Every 3 years due to forced upgrades or just old style deprecation over 3 years.

iPads don’t deprecate in 3 years, nor require forced upgrades. They get nowhere near as much support as a regular Linux laptop (which is what schools SHOULD be using) and even less than Windows laptops pre-11, but if they’re being replaced every 3 years, that’s just policy, not an actual need. Currently the oldest supported iPad is going to hit 8 years since release in a month. The newest unsupported one is going to hit 9 in a month. So yes there’s forced upgrades, but that’s in like 8 years.

I work as a software engineer and most companies have had a minimum 3 year lifetime policy for company laptops. Reasoning being, after 3 years there’s a higher chance of failure, and there have been enough advancements in hardware that upgrading might save SOME dev time. If it fails before 3 years, you get a new one. If you want to keep it longer, you can keep it. But if you want a new one, it should be 3 years old first. I don’t get why school iPads need to be replaced this often, but I reckon there might be a lot more wear and tear and THAT could be the reason for a 3 year replacement policy. It’s simpler than just replacing individual units every now and then.