Theoretical one is lower than that of lidar, but in practice a well made mm-wave radar, currently, has superior resolution to commercially available lidars

Can you point to any reasonably priced mm wave radar that has greater than lidar resolution? Genuine question.

I researched the topic further, I would say that commercial offerings for automotive use with 1<degree resolution are not yet there, but that can be achieved.

Generally, to increase resolution you can do following - increase antenna size, increase number of antennas, increase amount of processing power thrown on it.

Right now, existing offerings can be improved in all 3 ways with ease.

I mean sure, but there are difficulties with doing so, no? I mean,even the military has only really relatively recently been using AESA radars.

Yeah some links to actual products would be nice