Lower prices, better battery life/standby time and all the benefits that come when a single company controls the OS and the processor/hardware it runs on (rather than being tied to Intels release schedule).
Basically everything that MS/Qualcomm are trying to get with their Windows on ARM, except far superior in every regard.
How about broken software for at least a few years while non-Apple devs decide if they want to re-code their offerings yet again, especially when the rest of the line is still based in intel?
How about abandonware when devs decide it's just not worth it to re-code again?
Is there a Rosetta-type product available to somewhat smooth this kind of transition? Or would this be the harsher kind of CPU change, where stuff just breaks and Mac people need to own 2 Macs and hop back & forth to be able to use their key software (not made by Apple).
How about consumer confusion that some Apple Mac software runs on this new computer and some doesn't?
How about (probably) no more bootcamp so we can go back to a world where we need separate computers instead of killing 2 birds with one stone? I know someone like you probably would not give a hoot about Windows compatibility but everyone else is not you. For some, it's very nice to be able to switch into Windows when our clients need something done in Windows and/or the only way to connect or do something for clients requires a Windows computer... much nicer than having to lug along a
second computer just in case and/or do without or let down a client.
And I have zero faith that Apple hardware deprecation = lower prices. Instead, when Apple kicks hardware features out, pricing seems to RISE. Where you may perceive Apple would deliver lower prices, I expect Apple would enjoy higher margins by not lowering prices.
Apple used to control the OS and the processor/hardware it ran on. Ultimately, that drove them to switch to Intel.