"Official" support. Is there anything actually preventing corporations from installing Windows 10 on these machines before the EOL date? After the EOL date?
Just regulation and contracts with support. Dell won't support your laptops if you don't abide by their rules, or if they do allow you, they'll charge you way more. In that scenario, big corps will have to bring support in-house, which no one will want as that is unwanted organic growth impacting margins or just pay more, which is something they don't want either.
Thing is, they want to wait for the very last minute in order to migrate from what I've been told. At least, until their technical teams in charge of supporting the laptops (specially; not even touching Windows Server yet XD) actually agree with no caveats or they're forced to do so.
In our Company they're using some people in different regions to test localization and other things in regards security software and monitoring preparing for the global rollout next fiscal year and it looks like other companies are also doing that. Very carefully. Which is completely different from Win10. When it was available, the rollout took 2 years in total and even old laptops were upgraded. Now only some current laptops can be upgraded, so most will have to wait for the refresh cycle.
So yeah, I'll keep my "not supporting Win10 is a stupid idea" position.
EDIT: Also, because MS is screwing with AMD left right and center, like they always do. And AMD just keeps taking the abuse, which is pathetic.
Regards.