Not sure if you all have noticed how many WGs have sprung up and have no feedback in the Derby area. You do a search and a good proportion come back with zero.
Some have been on the site for ages.
However if you TOFTT, then leave feed back your anonymity is blow, and people on here will know who you are on AW, and this could then lead to the Wgs knowing who you are. (This is why I have not left reviews for the last 2-3 punts)
I prefer a bit of research first, before I even short list and pick up a phone, for a booking. Even then, if I don't like what I see, hear or feel at a punt. I walk away, without handing over any money

I may have lost, that time

by walking, but I still have the funds for another punt (plan B, C, D or another day etc).
That Punting:
is wondrous, with treasures to satiate desires both subtle and gross. But it's not for the timid 
Some of my best punts have been with W/G that had 0 feedback on A/W. I use it like any other tool, which best suits my needs, at a given time.
I've only used the A/W email system a few times, due to R/B or flirts. IMO, its a waste of time and it only resulted in negative experiences.
If a W/G isn't displaying a number or willing to provide one, I just move on.
Its up W/G how they wish to conduct bookings and who they wish to see.
But don't care for or have very little use, for some part of the AW systems (emails, RB, bookings, feedback, etc). Its to open to abuse and misuse, IMO.
Currently, I won't change the way I book (and pay for) a W/G, regardless of her feedback or reviews, on A/W or UKP and UKE.
Its just the way I punt. No phone number = no booking from me. Feedback on A/W required = No booking from me.
My A/W account is 6 + years old and it has no feedback on it and its going to stay that way for some time.
I don't need some 2 liners on A/W, just to please or state I'm a punter, to a W/G
I use a phone, good manners and cash. The rest is in her hands after that point (service, attitude and VFM)