You’re a meanie face op! Delves have the ability to be anything else dungeons cannot be. They aren’t bound by the same rules which is cool.
Also, grouping should always be superior as you have more tools to work through it. There’s no way really good dps and healers will ever compare to Brann while you Tank for them.
it’s a simple fix without changing anything with the classes. just make different damage modifiers for attack and defense of classes as a passive for a class when they do delve’s solo. you give certain classes a 10% bonus to defense or attack for example. That would allow for that class to get through the delve without having to be 590-600 ilvl while other classes can just spam AOE, use pets as tanks, or stay at range at 570 ilvl to complete the same delve at the same tier.
It’s funny that the list of games you googled mentions WoW, since WoW is already on that list you can stop pushing the solo player agenda since WoW already has it all. lol
I just used classic as an example which you argued against and now you think you are pulling a gotcha … seriously dude you are just a troll. You can talk to yourself next time, on to ignore for you.