Overuse of Switch Palace blocks and events.

[Alucard648]

Is this bad level design instance or not? For instance: chasing koopa generators blocked off in boss fights, access to checkpoints in super-long levels, nearly impossible jumps trivalized etc.

[ElectriKong]

I'd argue that locking checkpoints behind secrets is not good design, but there's nothing wrong with rewarding players with an easier time for finding secrets. I don't like chasing koopa generators though.

[Enjl]

I'd argue that locking checkpoints behind secrets is not good design

Counterpoint: the level in question could be intended to be a marathon, where a checkpoint is an accessibility feature

[ShadowStarX]

I'd argue that locking checkpoints behind secrets is not good design, but there's nothing wrong with rewarding players with an easier time for finding secrets. I don't like chasing koopa generators though.

Different counterpoint: the Checkpoints don't have to be linear either, so you can easily just put a checkpoint at the start of a secret area if the size justifies it.

[Enjl]

I'd argue that locking checkpoints behind secrets is not good design, but there's nothing wrong with rewarding players with an easier time for finding secrets. I don't like chasing koopa generators though.

Different counterpoint: the Checkpoints don't have to be linear either, so you can easily just put a checkpoint at the start of a secret area if the size justifies it.

This misses the point of the message you are replying to. The original point was about locking a conventionally accessible checkpoint (on the main route) behind a secret (optional bonus, like red palace switch). Not about placing a checkpoint in a secret path of a level.