Those are all arguably good points. It just doesn't make sense to me when it's time to play with other musicians. Unless of course, they have the same approach to practicing with a metronome... which in my opinion, is highly unlikely.Not if you set the click on 2 and 4. Then it's just a rock steady back beat, against which one can groove for days.
Playing naked against a 4/4 metronome is certainly not as fun as with a drum machine pattern, backing track or band. It will mercilessly expose every shortcoming on MY own timing. Of course I can't come close the live groove of living breathing players, but I can achieve some degree of "feel" against a metronome. It ain't easy when it's all on me, however. but that's the point: it forces me to own the mistakes in a way that drum machines / tracks / a band would smooth over.
I feel that the "true" metronome is the drummer and everyone else in the band needs to feed off him/her.