D&D and Pathfinder are like Baseball and Softball, maybe. But going from D&D to Fate or PbtA is like changing to football or fencing. It's very different. Trying to get someone who's playing Baseball to take up soccer is tricky. D&D is baseball. Pathfinder is softball. Easier transition.
I think more like "I play baseball" Vs "I play softball/rounders/cricket".
It's not that difficult to convince people who enjoy little league to try standard baseball.
D&D and Pathfinder are like Baseball and Softball, maybe. But going from D&D to Fate or PbtA is like changing to football or fencing. It's very different. Trying to get someone who's playing Baseball to take up soccer is tricky. D&D is baseball. Pathfinder is softball. Easier transition.