Again, two weapon fighting was a thing in 2e, and you could burn a couple of proficiencies to reduce your penalties to zero.
Look, I'm not saying anything particularly weird here. In 1e and 2e, fighters were very popular because fighters were the undisputed damage kings. Clerics and thieves weren't even in the same zip code. Wizards, eventually, got there, but, for the first six levels or so, wizards had so few spell slots - remember, 1e, no bonus spells whatsoever for Magic Users- that your fighter was the star of the show in combat. In 2e, your fighter got HUGE boosts to damage from 1e. Multiple attacks at 1st level. +1 to hit and +2 to damage as well. Two weapon fighting from the Complete Fighter. The fighter was literally death on toast.
3e changed all that. Massively boosted monster HP. Cut fighter damage in about half. Massively boosted monster damage output as well, meaning that the fighter was getting mauled so badly in combat as well.
A 2e hill giant had 12 HD +1-2. So, about 50, 60 HP. Not a whole lot more than a 1e Hill Giant. The 3e Hill Giant has baseline 102 HP, deals 4d6+20 points of damage vs the 2e's 2d12+7 (and that's not including things like Power Attack, which can easily double the 3e giant's damage output - a -1/hit for every +2 damage. Drop +5 to the giant's attack (making it +11/+6, still easily hitting a 7th level fighter and deal 4d6+40 damage - quite likely dropping that 7th level fighter in a single round). The 2e's hill giant takes several rounds just to threaten a 7th level fighter. Meanwhile, that 7th level fighter is obliterating a 2e hill giant in 2 rounds. 5 attacks (3 longsword,+ short sword) dealing 3d10+2d8+4+4XStr bonus (probably +3). Mr 3e fighter is a pile of goo on the ground in the 2nd round against a 3e hill giant. Mr. 7th level 2e fighter probably hasn't even broken a sweat.
THAT'S the difference here. That's why people loved fighters. That's why people go on and on about why fighters need some sort of boost in later era D&D. Because we loved that fighters were actually warriors back in the day.