I don’t trust any of the major phone manufacturers to update my device for an extended time. It is intrinsically against their interest to support a platform long term at the expense of a missed sale on a new device.

Not that I like Motorola, but they do offer an unlocked bootloader on most of their phones. LineageOS supports a number of them officially, which makes for a very easy install and extended support model. Not bad for a $300 phone.

I don’t believe this is true, though I’m certainly no expert on the subject. Taiwan Semiconductor is the largest manufacturer of the chips, but they use lithography equipment manufactured by the Dutch company ASML.