BJJ does not start on the ground as standard, let alone "all the time". Matches start standing, and if you are only training from the ground you are missing out. That's not to say that stand-up and takedown training aren't much more in-depth in judo than in jiu-jitsu, though.

As someone who used to train at an MMA gym, going to a pure BJJ gym is weird because yeah, I'll shrimp out, get up to my feet, and my training partner is sitting there on their knees waiting for me to re-engage and my first thought is "this would be a great time for a kick to that completely unprotected noggin right there..."

Of course once on the ground, the BJJ peeps dominate, which is what UFC spent 3 decades demonstrating!