If you receive no instructions to the contrary, you are expected to intercept the relevant LOC if on an intercept track of less than 70 degrees. If you don't, you will stray into parallel traffic
This seems to be standard at most french airports, took me by surprise first few times.
(I did hear that it started because French pilots didnt like being told what to do by "mere" ATC. So ATC said "in that case, get on with it!")