If that's what I do and it is recommended on here then why does anyone think that a WG would not do the same?
Because she's the service provider
I also do due diligence when selecting a plumber or choosing a restaurant, but you can imagine my response (and I can imagine yours) if a restaurant turned round to me and insisted I demonstrate feedback from five other restaurants, two of which in the last six months.
It happens, some prossies insist on feedback and it's up to you if you want to jump through her hoops, but let's not dress it up as something it isn't and claim it's to be expected/reasonable.