Yes, that's a good point. Multiple namespaces arose in Lisps before things like FLET and LABELS, so this particular issue is likelier to come up in Common Lisp

Yes, that's a good point. Multiple namespaces arose in Lisps before things like FLET and LABELS, so this particular issue is likelier to come up in Common Lisp nowadays. I think there are several historical considerations in play and https://www.dreamsongs.com/Separation.html https://www.dreamsongs.com/Separation.html (as mentioned) is probably the best source for more information.