These threads always kind of confuse me, I never actually see these people who are screaming how great they are from the mountain tops, addons or not.
Here’s my 2 cents though, I mythic raid, and in my personal experience, the devs build mythic raid with addons in mind. Its incredibly often each tier to have a handful of mechanics that demand addons. Does it make for super interesting gameplay in those moments? I personally dont think so. But they exist, and plenty cant be done in time without addons, and even with them, people make mistakes.
Do addons make the game easier? Absolutely! But I would make the argument that they are expected from blizzard, and thats just how it is. You can walk 10 miles to work, but in all likelihood you’re expected to drive if you want to make it in time.