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Using Linux on laptops for 10+ years without any problem. Just buy it preinstalled.

Compared to laptops, smartphones have more sensors, and more complicated camera setup. That's about it. They're not significantly more complicated than laptops.

But also more vendors, market fragmentation, and far less open-source firmware?

Almost no laptops have opensource firmware.

I think specific devices will have more likely positive outcome over time as chips don't become more performant = the design wont be obsolete and still sell many years later.

Modular devices (laptops are a mix of many modems, displays, sound, disk etc.) have had more edge case bugs because the volume is too low per generation to warrant fixes.