Wileyfox Swift (1st Gen)
is still rocking it for me. Certainly doesn't feel outdated. Dual SIM. Extendable memory. Removable battery. Decent screen size. (Switched to Lineage OS with no complaints).
Only feature it lacks that I might have been tempted with, is NFC. But that's more down to Travel West Midlands shitty "Swiftcard" implementation than a real need. I've still managed this far without Google pay.
(My starting point is not to buy anything Apple, so not having Apple pay is a given)
Can't speak for the "experts" but last strategy piece I was paid for said that smartphone sales would decrease 2016-2020.