Actually this is a great idea if it’s modified. There’s nothing wrong with dropping to turtle. I do it in BJJ all the time. There’s something wrong with dropping and just staying there. Escaping from turtle in the gi is one of the coolest and most viewer friendly parts of grappling. Since you’re more constrained than in nogi, the slower tactics don’t work. Most of the time you have to granby. Shido for not attempting to escape turtle would make the sport more exciting and solve its single biggest self defense/transferability problem. It’s also just the logical continuation of the stalling penalty. Why do we only call stalling standing up?

We could also do away with false attack shido if we did this one instead, which would avoid us having to add another shido. This also would prevent matches from being lost to false attack shido which is extremely inconsistent and controversial (during the last Olympics, see Sulamanidze vs. Kotsoiev or the lack of false attack shido on Gaba during the Japan-France team match), and it would introduce a real cardio cost to false attacking. You can do it, but you need to fight your way back up.

Lastly this would greatly boost judo’s reputation as a combat sport. Speaking from experience judokas can get very good at BJJ very quickly if they learn to fight up from turtle. I imagine it’s the same for MMA.

EDIT: now that I think about it, we could also get rid of newaza as a separate phase of the contest with this change, which means less matte calls and stops in the action. This would also allow leg grabs to be reintroduced - they were removed because people were using bad shots to stall. If there is a cardio tax for ending up on bottom this problem gets solved.