It's just a safe pattern that's easy to implement. If your services back-off attempts happen to be synced, for whatever reason, even if they are backing off and not slamming AWS with retries, when it comes online they might slam your backend.
It's also polite to external services but at the scale of something like AWS that's not a concern for most.
I have a Samsung A32 and the bloatware has been completely unobtrusive for me so far, and no ads either.
My purchasing and usage habits for mobile devices is to get something new that is mid or low-range, use it until I notice performance issues, or the bloatware does something I don't like, then flash a custom ROM.
That's served me pretty well in the past, but I may still have hangups from teething pains with rooting devices and compatibility issues on custom ROMs back in the 2010's
It's also polite to external services but at the scale of something like AWS that's not a concern for most.