Nobody is forcing people to switch to new android smarphone devices but many people do it because phones stop working after few years, apps are not supported, etc.
Actually they do work, just certain apps won't work on won't update.
(I do agree with your conclusion though).
Answer to you question would be that you can't really use Electrum wallet now with older ledger devices like Ledger Nano, Ledger Unplugged and Ledger Blue.
On the other hand, first ever hardware wallet device Trezor One is still working just fine with Electrum, so you see the difference.
I am just saying that people who buy ledger nano S device now are basically wasting their money, clear and simple.
I don't know how long after the production has stopped they have become (more or less) unusable. It could give us a hint for what to expect, although it also depends on what vulnerabilities are found and when.
For example,
you can see here an obsolete Ledger HW.1 still working, although only with legacy addresses (including nested SegWit).
So, while I agree more than 90% with you, I find you a bit too harsh

Something else has also occurred to me. Although they'll discontinue Nano S, after some while, I expect that for many years to come they'll get support tickets from people keeping their money on a Nano S and "now" no longer working.