Profiles are not secret and are easy to find still. You just have to know how to look.
https://us.diablo3.com/en/profile/MissCheetah-1661/career
For anyone you want to find, just hover over their avatar and it will show you the full battletag including the number associated with it. When I reply to someone, it also shows the Btag at the top of the post reply window. Plug that into the web address template above. If the person is EU, sub “eu” where it says “us” or “kr” for Asia.