Holding left click to break blocks has delay in creative mode

pretty sure it's intended, you normally won't want to accidentally break more blocks than the one you're aiming.

Can confirm in 20w51a.

Can confirm in 21w03a. This may be intentional however, I do not make that decision.

Can confirm in 21w08b. Video attached.

Can confirm in 21w11a.

Can confirm in 21w13a.

Can confirm in 21w16a.

Can confirm in 1.17.

Can confirm in 1.17.1 Release Candidate 2. Easily reproducible with scaffolding.