>>718315076
Straight up not true. Gamepads were used competitively in plenty of games but were most popular starting in SF4.
The reason? We finally had arcade equivalent games that could be played at home, and people's first exposure to the game was at home. Japan always used sticks because they played the games first in Arcade (All versions of SFIV released in arcade in Japan prior to console releases, which gave Japan a huge head start and is one of the major reasons they dominated), but when it came to the West the arcade releases were smaller and more niche and so most people had to wait for the console ports.
SF4 was the last hurrah of the arcade fighter. SFV was released on consoles worldwide and even more people got into the game just by buying it on their playstation or later PC.
Nowadays though most competitive players play on hitbox. Gamepad is rarer but some people still play on it. Fight sticks are basically extinct because they are objectively worse.
tl;dr - Gamepads got popular in SF4 (before any modern controls) and nowadays hitboxes (aka leverless) are most popular.