With these kind of threads, typically:
You will get a few people telling you yes essential blah blah and using some anecdote to justify this such as "I got 3 Strava KOM's the next day", "my left testicle is no longer numb" etc.
.
You will get some people saying no, waste of money, look on youtube and do it yourself.
I'll go somewhere in the middle and say, it may offer some benefits but it is far from guaranteed. I would NOT go with any "fitting system" I would go to a sports therapist with a lot of experience in cycling that offers bike fitting services.