The question you have to ask yourself is if you NEED the features that come with the new OS? Newer OSes typically do nothing for older hardware. They aren't written with older hardware in mind. So if you have a 2010 Mac Pro tower, Monterey isn't really a plus (assuming you can get it to run at all).
The only reason you have to migrate forward is when your hardware dies, like literally, or when the applications you use no longer support the platform you are on. Subscription based software falls into this category as it is forever updating to the latest OS versions. Box software typically does not get affected by OS updates because it's more static in that it was also written with older hardware in mind at the time. It's only the updated versions that perhaps require an updated OS or hardware.
The reality is, ANY new computer is likely to run circles around older ones. Same can be said for just about everything. But, does newer necessarily mean the old is no longer useful? No. Classic cars... ancient by today's standards... fuel hogs to say the least... kiss Mother Earth goodbye... but still beloved and running to this very day.
Funny thing is, new stuff tends to have a very short shelf life compared to the old... primarily because they are designed to be replaced. So for example, that 2010 Mac Pro tower is still going strong 11 years later and yet people replace their 2019 computers almost hourly by comparison.
So when I said "all in"... I meant, you buy an ARM Mac, you are an ARM Mac person going forward. It doesn't have a toe in the INTEL Mac world (Rosetta 2 will be removed and you won't have access to anything non-ARM as soon as Apple transitions their entire line to ARM). They did this with their transition from PPC to INTEL. ARM will do the same.
INTEL Macs were the only ones to actually allow you to run Windows on a Mac... natively. A pretty big feature if you ask me because a lot of people have to do stuff with Windows software in their daily business whether they want to or not. These new Macs don't offer that. It's more, you're a Mac zealot, so you don't need Windows anymore. For some, that may be true, but for others, not so much.
The decision is ultimately yours to make... just make sure it's your decision and not someone else's.