For a year or two, lastpass for Firefox didn't have the copy option for usernames and passwords. I had to edit, show password, then copy.
The autofill problem became pronounced after the acquisition as well probably through no fault of the new owner. Many sites like Google and Microsoft have switched to a multi-step login process where username is entered first and password is entered on a different page
Also a proof of sites abusing autofill & hidden forms to steal passwords probably influenced the current situation.