GrapheneOS have written about (in)security of LineageOS:
https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...
I agree, but that is also totally unrealistic for normal people.
Btw, My son has a 200 eur Samsung Galaxy A26, very fine device for the price I have to say, and supported until feb 2031.
Installing Lineage isn't that hard. If they're going to badly inconvenience some customers / force hardware purchases, why not start with the ones who are most likely to get their accounts drained?