In previous versions, there was an unintentional feature/bug where you could remap the W key while mining, and it would let you move and mine at the same time.
This was patched in 1.21.6, but I think it should be brought back as an official feature, or at least be available in settings or with a toggle (e.g. “Allow movement while mining”).
It allowed for smoother gameplay, especially when mining tunnels or in custom PvE/PvP scenarios where stopping movement every time to mine felt clunky.
I personally found it fun and useful — and it added a unique skill-based trick. Please consider bringing it back!
This is feedback.