As a new rider with past health issues (knee surgeries, back issues) a bike fit was very importantent to me cause I wanted to start out right.

If I was in my 20's, I would have blazed my way through it myself learning as I go. But now that I am older, I cant recover as fast from a mistake, and I have an example...

Ii recently got my 1st road bike, I rode it for 5 days. My elbows started to hurt, so much that i couldnt straighten my arms and had lots of issues with a typing on the computer.

Got the bike fit.. moved my handle bar stem from 120mm to 80mm. The rest of my setup turned out be just about right (seat, cranks etc etc) with minor tweaks.

The elbow thing is cubital tunnel syndrome. Never had it in my life. Of course that dont mean that I wouldnt have had issues with the correct set up. But I do wonder what if... I am still have the occasional issue with my elbows now