So I'm not using docker or Python so my opinion isn't so worthwhile but I would say you made the right choice for right now.

I have an M1 Air and ended up listing my iMac I use for work as the Air was just wholely faster for my tasks. For the average dev, I think there's a weird hap right now of "M1 now vs M1X/M2". It's getting later in the cycle and while M1 support has greatly gotten better, it's now closer to new models with drastic changes.

Now in my use (TS/Node), the M1 in native Node is unbelievable, it's twice as fast as Intel machines. But that's my use case.