The fuss is simply that I find it easier for the WG to meet you in your room directly and it's easier when she's fully independent.
Couple of scenarios that happened to me whilst away in London on business and horny as hell...
1. Met WG in reception, guess what? She looked / dressed like a hooker. It was a bit embarassing (backpage special) more so because Sergei turned up to collect the money
2. I thought WG could come to my room, but I didn't realise and she had to call up to my room. Thus at that point, she could have known my real name
3. In the above secondary scenario, I believe the WG took the money and went to give it to Sergei but she never returned (yes I was stupidly trusting)
All in all, if you're already staying at the hotel on business, it's far easier for WG to come straight to the room. No BS