Red Castle
Adventurer
I have no doubt, I just looked in the intro of the 3.5 DMG for fun and they do say, right in the first page:All of this applies to 3e as well.
''The D&D game assumes the use of miniature figures, and the rules are written from that perspective. This book contains a battlegrid and other tools to help you visualize the action.''
But, although my experience with 3.5 is limited (I was burned out of DnD back then and played other TTRPG instead), I do believe that it was easier to play Theater of the Mind with it, so maybe players felt less that miniatures were required? Honestly, just guessing here.