You can, and some people end up with something fine.
What usually happens is different. You buy a template on an optimistic Sunday, spend one weekend on fonts, one fighting the mobile view, and a third not opening it at all, and it ends up in a browser tab you won’t close.
AI will hand you 6 pages in an afternoon and no opinion about what belongs on them, which is the part that’s actually hard. Deciding what your homepage says in the first 10 seconds, so a stranger knows in one glance they’re in the right place, is still a judgment call somebody has to make.