@chiefgyk3d @Dan @mastohost i dunno, I made the same prediction about brands putting their Facebook page on their product packaging instead of a bespoke website, yet here we are a decade and a half later and it still seems pretty accepted.
Possibly even preferred, tbh -- you know what you're getting when you visit https://[bigco]/brand, vs spending one of your risky-clicks-of-the-day on some random domain. Just because I think someone makes a good pair of shoes doesn't mean I trust them to adequately run a web property, and it's probably a lot easier for me to fly under the radar with a fake https://brand.tld domain than with a fake https://[bigco]/brand.
Not saying that's my preference to be clear -- just that I don't think it'll necessarily be seen as unprofessional by people in general.