It really depends what you are doing. The M1 is more than fast enough for most people’s computing needs, but I think the sweet spot is in the base configurations. Even if you need something like 16/512 financially an iMac 24” still makes sense compared to a base spec 14” MBP with M1 Pro. The base at 1450 euros is comparatively affordable.
And some people will just like the all-in-one form factor, compared to a laptop.