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I think there is a bit too much variability. So for your example of add a socket it could be really easy into an internal partition wall with easy access and a circuit with loads of capacity or it could be a solid wall that crumbles when you start drilling it on an ancient circuit with knackered cables. An electrician can spot a lot of that and quote when they visit the property but it would be really hard to do from a photo. So then you are into the decent tradespeople are too busy to want to bother with small jobs and when they do people don't want to pay for the travel time (could easily have 2+ hours travel for a 1 hour job).
But yeah, it sucks. It took us a decade to get round to some jobs because of the hassle factors.
I am thinking if I were a tradesperson with no track record yet, I'd love a platform where I could just pick off some small jobs if I were just starting out, to build a reputation. Getting work done on your house hasn't been revolutionised by the internet yet - sites like MyBuilder are still just quotation/review sites. To be able to select a specific job from a dropdown and get an instant price based on the going rate, then lock it in, would be amazing.