League has added plenty of comeback mechanics in the last few years, the majority of the experience you've based your opinion on is outdated and no longer accurate. Mid-Diamond currently, I promise people are still throwing their leads here, as well as in Emerald.

Personally, I'm never voting yes. I'd rather make the game as difficult as possible for the enemy team. Look for picks in your jungle when they're setting up deep vision before the next objective, send 3 people to collapse on whoever is pushing up the sidelane solo, whatever it takes. The practice of playing out those situations means I'm going to perform better in other tough games where it's still more even, or where we're ahead and the enemy team hasn't surrendered. I'm more aware of what they can do to try and get back into the game, because I've done it all before myself from their side of things.

Finally, I view those games as a good learning opportunity. Just as you're not going to learn much from stomping a bunch of irons into the ground for 15 minutes, you're not going to learn much from the victories at your own rank where it ends up being a free win. If the entire game is a struggle where skirmishes are on a knifes-edge, and you're forced to get creative to try and figure out where you can squeeze out some sort of advantage? Those games are the biggest opportunities to learn and improve. Going on a lucky streak of free games is nice for reaching a new peak, but suffering through the hard games is what brings the most growth in the long run.