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aggi
They are only testing in proximity. It's just not reliable enough to meet the standards for safe working. The standards are definitely a high bar but there is a difference between a careful homeowner taking on a few jobs a year and a professional electrician working in all kinds of situations every working day.
So there might not be any problem with your method but it's not complying with the standards.
There's a more detailed description here :-
https://elecsafety.co.uk/standards-for-electrical-test-instruments-and-test-leads/