They both started out decently but quickly disintegrated after a season or so. Both fell victim to writers/producers having to out-do their past Season which takes every season into evermore absurdity.

Both quickly left the Star Trek-y ways and turned into generic cataclysmic end-of-the-world plots et cetera. Take TNG, DS9 and SNW: Dial the dramatics and action by x25 and you have Discovery/Picard. It's very over the top.