No one said that it's a "terrible idea". For me (matter of tastes), it's "boring quests" whitout any story at all (go kill enemies, go pick up an item, again, again and again). Quests that I never do in any games and a feature who don't push me to play more longer after completing the main quest.
It's only a CDPR decision to "manually" made all of the quests in their game (and it's only my opinion, but radiant quests without story don't match in a story driven game).
Adding in radiant-like missions through the Police or even Gangs still maintains the overall story. No, it doesn't contribute to the main quest itself but being asked through radiant tasks to take care of Crime reports or to assist one gang with a rival gang isn't unlike any of the other side quests given out when we get the call while passing or approaching the scene of a crime.
I feel that it can add longevity to the game for those who would like to continue exploring and playing in Night City.