Did my solicitor fail to do his job?

Hi there,
This question relates to Scottish Law when buying property.
Long story short I am going around in circles, everyone, including the Law Society says the following is a grey area:

I bought a home with no-one over looking the back-a main reason for buying it. Turns out there is planning permission for nearly 200 houses to go in the land.  The planning request went in 5 years ago and again 6 months before I purchased.

Surely my thousands to the solicitor would include them searching for planning requests in the area impacting my property?

I know there are searches for mining, planning on the house itself.  Surely there should be for surrounding land, neighbouring land so to speak?

I am getting conflicting information.

The owner has lied as they didn't tell us and that is a different story.  For now I would really appreciate knowing did the solicitor fail his job?

Thanks so much for answers/advice I am at a loss....  I spoke to another solicitor in Scotland however their code of conduct means they don't talk "negatively" about other solicitors....