No ....not exceptional at all. Most of Europe use the German schuko scrapping earth type Euro plug tops that are not polarised, Even France allows the use of the unearthed Euro socket for double insulated /Class 2 appliances. so it's a case of DP breakers and RCBO's etc. In the UK, USA, Aussie and many other countries ....ALL outlets and plug tops are polarised, so only the phase conductor, requires circuit protection parameters....
What i would say here, that as France makes use of many rural TT systems, ...It would also make sense to use DP RCDs and RCBO's. ...All countries have there own little quirky ways of doing things, but all will have an end result of keeping the installation safe!!!