Pidcock is maybe the 10th or 15th-best climber in the race but still wins on the most iconic MTF. The 10th-best sprinter has no chance of winning the most iconic sprint. Also, it usually isn't a choice between sprints and mountain stages, rather a choice between a guaranteed sprint and a day where you have some climbs to drop the sprinters who can't climb or help out the breakaway. Basically the Carcassonne stage last year versus the stage this year.Only good climbers can win a mountain stage lol
Sprinting is part of cycling, it's that simple. 9 sprint stages is dumb tho, but so are 3. Riders also need easier stages. Do you really think everyone in the peloton is happy is every stage is hard?