Not so much an issue as a feature. The point is that what spells can do is relative, and just because magic is inherently reality warping relative to our real world, doesn't make that an appropriate moniker in a world where magic actually does exist and is well permeated as part of that reality.
A meteor storm is flashy, but not inherently something "more" than a simple wild fire just by virtue of being difficult magic.
This is just so utterly baffling to me. How is this difficult to get? Yeah, a wildfire is real dangerous, but to start a wildfire, you need miles and miles of flammable material. Know what Meteor Swarm does to flammable material? It catches it on fire. Like, do I have to explain why a missile carrying napalm is more dangerous than a match, even though both can start a forest fire?
Here, let me put some perspective into this for you. Maybe this will help.
The DMG states that an anti-material rifle, these do 6d8 damage and have two shots. So 12d8 damage or 54 average. This is meant to emulate sci-fi weapons like the BFG and other massive damage energy guns. The Meteor Swarm does 40d6 or 140 damage. Yes, if I blew up 76 nukes across 56 miles of terrain, I'd do more devastation, but we are talking about an amount of damage equal to missiles with near pin-point accuracy and next to no collateral damage. ICBM's in today's world? They devastate the area for a kilometer. But the meteor swarm does functionally equivalent damage and can be narrowed to only an 80 ft diameter, or widened to a 160 ft diameter.
In a world where wooden boats and brick houses are the pinnacle of construction, having a hyper accurate ICBM with controllable collateral damage ISN'T warping?
Like this spiffy bag of holding I bought at Wal-Bogs with a coupon. whoop di doo.
Ah, I see. Magic isn't impressive when compared to magic. Having a pocket dimension the size of a house is nothing because you can buy a pocket dimension the size of a room. The argument is that the world is so magical that high level magic barely registers.
Okay, cool. So other than the power of money (which casters can make far more of far more easily) what does a martial bring to the table that can compete with all this magic?
Peanuts. (And incidentally also something we may well be getting close to doing in our real world)
We are no where close to literal immortality. Even if we stop old age (which I think is what you are refering to) you can still be shot and killed. However, Clone doesn't care. You can be disintegrated into ashes and you will come back to life. This is far beyond what we are currently capable of.
Also... seriously? Medical Miracles thousands of years in the making, which will alter the world as we know it are just... peanuts? You need to have some flippin' respect for how much time, effort and literal death has gone into our medical science, because you are looking at the end result of thousands of years of work, and treating it like any person off the street could just have figured it out on their own.