PS - if the block is anything like the brick in our 60's ex-council house then I can understand the sparky not wanting to chase it. It's almost unchasable it's that 'kin hard. If not careful, the brick will just move in the mortar and push the plaster off the other side of the wall - with barely a scratch on the brick. Takes me hours to chase out a backbox, working carefully-but-purposefully with a scutch.
Yes, but no excuse to leave the cables proud of the finished plaster, he should have found an alternative route if that was the case.
And it doesn't alter the fact it's not in a safe zone.
If he HAD to chase the cables in that particular spot, he could perhaps have fitted a socket here, to create a cable zone, as it seems the socket circuit runs through here.
All in all clearly the work of someone who doesn't know what he's doing/doesn't care.
I know my son bought an electric tool to chase and it would grind through brick without a problem, he said that the time saved it was well worth the money the only problem was as one reached the ceiling it would not finish the job so last bit was down to hammer and chisel, he also had a tool for sinking sockets that was not as good, but it did help and left a flat base easier to mount the socket box.
But these tools cost and although an electrician who is a sole trader for many years would likely have them, those just starting with sole trading or those who worked for a company may not have them.
I remember the argument I had with a boss who wanted me to buy tools to speed up the work, I said if I don't buy them you will have to pay me over time to finish the job on time, if I do buy them you will not, so why should I buy the tools, if you want me to work faster then you buy the tools for me to use. However that idea seems not to sink in to bosses brains.
As to plaster depth it is hard sometime to work out what is going to happen, I have been caught out, fitted back boxes having been told wall to be plastered then found plaster board was used and my boxes too deep. All it needs is some random comment and you get unexpected results, the wife stating "I am going to do this room next and get it all re-plastered" she may be thinking of in 5 years time, but electrician thinks going to be re-plastered so I don't need to worry.
It happens a lot, I remember one job where the lady of the house was flitting around the electrician all day, asking if he could do that, or this to which he often answered yes. However when he presented his bill with all the extras included she wished she had kept her mouth shut.
From the pictures and comments it would seem a lazy fair electrician, however we only hear one side, comments which seem at the time nothing can result in the unexpected, simple things like keep it as cheap as you can, I'm strapped for cash, should in theroy not produce poor workmanship, but some people think they are doing what the customer asked when they cut corners to reduce costs.