I would find that frequency very intrusive unless there is a very good relationship with the agent. It is generally a horrible feeling to have a stranger come in and judge how you live and make a report on you. You can end up feeling less at home where you live, than in a hotel room (and with less power to complain and get money back!).
The tenancy we have now is the first where I have hope that there will be a two-way benefit as the landlady has been absolutely lovely so far :) nothing but terrible LLs previously :(
I think an annual check is plenty, 6 months maybe in the first year, but it has a to be two-way reporting and action.
It is absolutely intrusive to take a photo to 'prove' that the tenants are tidy, or 'look like the right kind of people' or just to alleviate a LL's anxiety.
Written reports are given much more weight than photographs when assessing deposit disputes etc. If the LL doesn't trust the agent's word, then they should inspect the property themselves and get a new agent.
If photos are needed they should not be of whole rooms showing only a general impression, but be close up and detailed eg showing skirting boards and flooring in high traffic areas where paint may be chipped or carpet/ flooring worn, or flaking paint on painted wooden windows/ sills, under and around the kitchen sink, gutters, sinks and baths to help assess for water damage, leaks and mould etc, paving stones etc to assess levelness and trip hazards, anything specific and useful to assess maintenance/ repair. That is what I look out for as a responsible tenant and former home owner (pre massive house price rises).
In 16 years of renting, I have never had anyone look for any of these things when doing an inspection - they didn't actually want to know about any problems that might give the LL hassle or expense (but happy to point out that there were 2 mugs and a plate to wash up), even if that lack of care was a complete false economy that led to greater expense in the long run. It has been very frustrating.
It is hard to enforce your rights though when there is so much competition for housing.