>>96172571
I'm not going to do a granular break down here, but I'll try to explain as best I can.
Gygax himself was on record in long past that DnD should be played by keeping track of EVERYTHING. You should know exactly how much time tasks take. How much food needs to be consumed. How much all your dumb crap weighs. Exactly who is carrying it. How long getting place to place takes. Even how long leveling up takes. More. Much more.
By shaving off all this busy work, you've removed the balance points DnD is originally built on. At least built on up to 3.5. Those too powerful full casters? No, they can't afford to dump all their spells on combat. Most of those should be saved for noncombat issues. Including incredibly mundane ones. Survival mechanics. Passing difficult terrain. Knowing where the hell you are. Bypassing the slow natural healing rate. Just to name a few obvious ones. These things are difficult and annoying precisely so you have a reason to spend resources to get past them. Full casters don't like having to reserve slots for sheer mundanity. It interferes with being cool. That's the point. On the other side, half casters have plenty of useful tools to bypass these kinds of mundane problems while still being almost as good as a plain fighter. The fighter himself comes out smelling rosey because SUDDENLY you realize a guy who can be set to blend for no cost is a massive gain to productivity. Better, you may be thankful the fighter is a minmaxer for once so you don't have to worry about your resource squeeze. If it can blend, let it blend. Save your resources for real problems that kill more adventurers than any amount of two headed giants or invisible dragons.
Player aversion to this kind of gameplay is probably why subsequent editions play the way they do. Ironically, people now enjoy DnD less. Or maybe that is exactly as expected and why things were designed that way.