.app/e or .app/le are not but look quite similar.

Don't most (and possibly all popular) browsers these days hide or de-emphasize the path in the address bar, showing only the domain?

the full host, including subdomains.

In my URL bar, .apple is bold and bright white, the /le on .app/le is grey and faded.

With modern browsers, I don't think this is a problem anymore. Subdomain attacks and query length attacks have already made browsers put address shenanigans mitigations into the address bar.