For practicing basics. Duh.
The problem: people practice their basics poorly so they don’t actually improve.
When you watch a video of yourself doing basics, are you in awe of how great you look?
Probably not.
You wouldn’t tell a beginner to do things the way you’ve been doing them.
So, go back to your basics. Fix your swing. Improve your fumikomi. Get your ki and your ken and your tai back together again.
Use basic practice for what it’s meant for: improving your Kendo.