In my experience your assumptions are pretty accurate.

While it's true the largely standing desks they use at the Centric are right in front of the guest room elevators, I did not find the staff to be especially competent. You get plenty of smiles and pleasantries, but when I wanted to ship baggage ahead, discuss some dining options and reservations and coordinate transit logistics, it took a lot more work and follow up on my end. Nothing like dealing with a Park Hyatt concierge. These folks just aren't trained and developed to play those roles. I have considerable experience in Tokyo, so I was able to work through it all, but if someone was less familiar, it felt like key requests would have fallen through the cracks.