But this wasn't true in pre 3E at all. Not if you were playing by the rules anyway.... It was printed in big bold letters that spell acquisition was firmly under the control of the DM.
That's like saying you don't have the ability to customize characters in 3rd Edition if the DM says "core rulebooks only".
Time for research = 2 wks per spell level
Cost of Research = 1d10x100gp per spell level
Success chance = 10% + 1% per ability score + 1% per xp level - (2 x spell level)
I played previous editions for years. I think I can count the number of times spells were researched on one hand. Possibly on one finger.
Wizards got their spells from leveling up and from looting spellbooks. If your DM was castrating your spell options, then your DM was castrating your spell options. I'm not sure what relevance that has on the actual qualities of the game system. And even if it is true, unless they were severely limiting your spell selection, the wizard class was still the most customizable class in previous editions.
Your best shot was by capturing spellbooks, but if you look at any official adventure, they rarely gave out that many captuired spellbooks. I'm not sure where this infinte customization idea come from unless you houseruled extensively.
And I'm not sure where you pulled the word "infinite" out of. I'm assuming your ass.