I had three instructors first time I did my PPL. The changes were deliberate by the school to sort out problems i had. (School had 6 full time instructors)
I let it lapse, and re-did most of it 20 years later. I had two instructors - change due to availability. I found it annoying - one would repeat the lesson so HE would know where I was. (School had 2 instructors only)