sunshadow21
Explorer
No, it really, really isn't. Magic being that powerful was largely a 3e artefact. Basic through 2e, wizards were so limited on the number of spells per day, learning new spells was not automatic, and there just weren't that many spells to be had. Basic/Expert has exactly 12 wizard spells of each level. That's it. Twelve spells. No one ever bitches about wizards or clerics stealing the show. Even AD&D 1e only had a handful of spells.
Funny, I've heard just as many, if not more, stories, about casters stealing the show in pre 3rd edition groups as I have in 3rd edition groups. The root cause in all editions is basically the same. Magic and spells are designed to be flashy and cool and kickass and really noticeable and memorable, and the reasons that many people play D&D is to have characters that are flashy, cool, kickass, and have lots of really cool and memorable stories. Accomplishing the latter in D&D that doesn't somehow involve magic as the final step is really, really, really, really tough unless the entire table is onboard with it, which means that all it takes is one person to screw that goal up. DMs that successfully control that one person almost never any noticeable issues until really high levels, which most people don't play at anyway. This is true of every single edition of D&D, past, current, and almost certainly future. 3E stands out not because it created the problem, but because it highlighted it so brightly that it absolutely could not be ignored while also not providing any solutions in the system itself. 5E may have put a few more masks back in the game, but the problem has existed in every edition. Even 4E only got around it by accepting it for what it was, and making everyone that powerful starting at level 1. Whether people think this is a good thing or a bad thing is a completely different conversation, and different people will be comfortable with different solutions of how to deal with it, but anyone who tries to argue magic has ever been anything but one of the core tenets of D&D is ignoring a lot of well proven and well known evidence out there.
Other systems don't have the same problems because most other systems don't focus quite so heavily on the magic system, making it easier for the DM to manage expectations. This amplifies the impact that the magic system has in D&D that much more, making it that much more visible.