If you create some new account on mobile, the workflow is messy. If you are on schedule like ordering a ticket, you just quickly try to get the job done.
You need to know the specific order how to create the password for a new site. Otherwise it was just easier to plow through with your favourite memorised combination.
At least I found it hard to do with Lastpass on mobile. Now I’ve tested it with Bitwarden and 1Password 8, they seem to do a better job with it.