One of the big problems is the sheer number of notams you could be looking at for a given trip - many of them for obstacles - for many, the name of the location means nothing (Vauxhall) and the idea of plotting them .... well !!
I know there are some good software packages which help but most don't pinpoint the locations.
In the days following the incident in London I noticed quite a substantial amount of new obstacle notams appearing at my local airfields.
I would also would not like to take a bet on how many accidents we will have in the future with GA aircraft and wind farms - some of these windmills are incredibly high.