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Are they?
My hunch is that “average ownership lifetime” for mobile phones is MUCH lower than you or I (or anyone who is careful with their phone) probably expects. There is probably a too-big segment of the market that is trading in yearly for a newer model.
Supported in the sense that “We will update your device and deliberately slow it, break it, or brick it because fuck you.”
Some certainly are. Most consumers keep their phones 2-3 years. Many are supported well beyond that.
Many now. Up until recently it was pretty common for manufacturers to leave you SOL after 2 major Android releases.