Earlier quoted context omitted.
When we do that, we lose control of the documents, we can't get at the history, we can't search them, we can't even find stuff in there, Except SharePoint does store history and you can search it. And no need to create a second Beta1 and Beta2 folder when you can just mark documents as release = Beta1 or release = Beta2.
Except that search was always borked, for various reasons (one really special reason was that search was utterly global, and didn't obey the access rules that were so vigorously enforced elsewhere, exposing details of your Super Secret Project to the rest of the company). So search was turned off, and good luck finding anything. Sheesh. And getting history out was, to put it mildly, a pain in the rear. Something I co…
I have seen SharePoint installations at big corporations and they are horrible.
In one case there was a central SharePoint group that has commissioned the sites. So we had a highly restricted, utterly gutted and badly corporate styled thing that was practically useless.
Add to that that there was a weird mix of public and enterprise editions (which cost a bunch of money and were frowned upon by the org unit).
In this environment you can sit back and watch productivity and common sense being choked to death. Enterprise is a weird place.