I'm not sure, I avoid LFR since there are too many people either afk or ignoring the few mechanics there are that inevitably wipes the raid. But it's crazy as a mythic raider to have to try to argue with former guildmates that Classic is not harder than Mythic difficulty raids lol. The main argument is because "threat is a real thing instead of in retail where it's faceroll" when it's just that the developers realized that threat is a stupid way to gauge as a mechanic when you can be much more creative.
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So you've beaten Mythic bosses in your spare time "far less time investment, forethought, etc.." then? Hell, even heroic until you severely outgear it as a mythic raider but even then you can still slip and end up wiping. Also the current time investment required to get your cloak up, get corruption affixes to your gear, get your essences unlocked, etc is actually still time-consuming despite the catch up mechanics added.
Classic raids were designed back in the day with the assumption that roughly half the raid wouldn't have good internet connection. Sure, you can make the argument that you needed to farm hours upon hours just to grind out a chance at that Nature Resist gear to drop, but I'd argue that's the result of a bad design.