The "tradition" is to sit, wait for a waiter to appear. Ask for purpose (lunch? big meal? just a drink?). Then you wait again for the correct menu to appear. Then you get asked for a drink. And wait for the drink. And then comes the longer wait where the waiter tries to detect when you are ready to order, if they see it at all.
Combined, that's some 20-30 mins in and the prepping of your meal hasn't even started yet.
Now if you're the kind of person that's going to be in there 3-4 hours anyway, the ritual doesn't harm, but it doesn't add much value either. It's needlessly slow and inefficient.
Your future dystopian nightmare is already here, and it's fine. In the Netherlands, some sushi restaurants work as follow. You are seated. There's an iPad for everyone, and people just tap what they want. Some minutes later, your food arrives. This supposed cold-hearted efficiency means I get to spend more time engaging with my friends, the very point of the visit.
By the way, you're not doing restaurants any favors with a slow and long visit. It means they can't use your table twice. So finish your meal in 1.5-2 hours and if still not bored with your friends, go to a damn bar.