You can run SSH from a Windows terminal without even having the WSL installed...

I do like 99% of the time and in quite specific cases from the host machine (Windows native openssh) - mainly due to my environment is in WSL in terms of dotfiles, cmd line prompt, shell history and so on.

That's a very limited terminal in terms of capabilities.

Then there's things like x11-style copy-paste.

PuTTY is from before WSL, and old habits die hard.