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Having to use a custom ROM is the same annoying amount of work as having to upgrade to a new phone every 2-3 years.

Because custom ROMs usually update to the latest Android version ASAP, which moves tons of things around all over the OS, and breaks a lot of stuff.

It's super annoying to update custom ROMs.

And frankly some people just want their phone to work most of the time, not to have the responsibility to install and maintain some pocket-sized server. That's also a reason against using custom ROMs.