The 2015 pro model i have is an absolute nightmare for the fan as the mic was picking up the noise of the fan and so the CPU was working overtime to cancel the noise leading to cascading fan and heat noise.
Ended up just disabling it completely permanently. Was a particularly bad design i think.
I recently got an M2 Macbook Pro to replace my 2017 Macbook Pro (with that awful keyboard and the touch bar), and my biggest take away is that I'm glad Jony Ive left. The new one is less "elegant", but it approaches and in some case exceeds "functional". It's crazy the number he did on the hardware designs at the end.
Ended up just disabling it completely permanently. Was a particularly bad design i think.