D&D General Mike Mearls says control spells are ruining 5th Edition

[Lanefan]

Because its the fault of fumble rules: They always affect martials more because "roll dice for more attacks" has always been a martial thing. Spellcasters never have situations where they're going to roll multiple dice for a hit, they only worry about damage

Ah, but if one does what D&D has for some inexplicable reason failed to do ever since day one and make casters roll to aim their AoE spells, ray spells, and any other spells that aren't on self or by touch, then...

Per your example just posted, the martial's gone and lost a valuable item that lets them fight on a better playing field, whereas sweet FA has happened to the casters.

This time, yes. In the past I've seen casters die outright due to fumbling their spells. Perhaps the most memorable example of such was a mage trying to cast Fireball while wearing a cloak that gave immunity to fire. He fumbled, and set the spell off at his feet - inside the fireproof cloak!

There wasn't much left to scrape up.

D&D is not designed for fumble rules and they do not work with how the game is made.

Which seems odd given we've had fumble rules, virtually unchanged since their inception, for well over 40 years and they've worked just fine.