It is most probably rare, if at all! But that does not mean that I shall not continue to advice that way.However, although we do occasionally see people who are persuaded by responses here not to attempt a particular job themselves, I'm not sure I can recall an occasion on which we have been aware of persuading someone to acquire the means and knowledge to do 'proper testing', particularly in relation to 'minor jobs'.
I believe I did answer that question, but I will put it another way for you.However, you seem reticent to actually answer the specific question - since we know that, no matter what we advise, the vast majority of electrical DIYers are not going to undertake 'full proper tests' do you believe that this means that they are not taking 'responsible precautions' and therefore that they should not undertake any electrical work?
If the lack the desired knowledge, skill, equipment and attitude, they should leave it to those that do!
I am not against any form of DIY, but it must be undertaken responsibly, with consideration not just for yourself but those that maybe affected by it.