Why? We can always find 'rationales' for upgrading for the newest, shiniest and most sparkly, but your self-professed needs don't really justify the move.
For my part, I moved from a MacBook Air to a M2 Mini (when that was new) and a SOHO desktop situation. The argument for myself was, yes, the additional speed and capabilities - but really, it's real rationale was acceptance that these old eyes would appreciate a larger screen. And rather than clamshell the Air, why not upgrade the Mac itself at the same time as getting the screen?
And the MacBook? I still have it for mobile work and travel and - full disclosure - its a 2017 Air Intel running Monterey, and is still capable of running a significant portion of the software I need.
For my part, I moved from a MacBook Air to a M2 Mini (when that was new) and a SOHO desktop situation. The argument for myself was, yes, the additional speed and capabilities - but really, it's real rationale was acceptance that these old eyes would appreciate a larger screen. And rather than clamshell the Air, why not upgrade the Mac itself at the same time as getting the screen?
And the MacBook? I still have it for mobile work and travel and - full disclosure - its a 2017 Air Intel running Monterey, and is still capable of running a significant portion of the software I need.