Of course, I will look at the M4 MBP to see what might be the 'must-have'.M1-M4 - same thing. I'm waiting for a new screen, redesign, etc.
However, I've a max'd out M1 16" MBP as workhorse & a M1 13" MBA for travel/outdoors. Neither is disappointing me for their intended purpose.
Beware M4 regret? A lot will depend on price/performance and when I might be considering that cascade of the M1 16" MBP to daughter to replace that earlier cascade of the pre-loved 15" 2015 MBP