His rationale was as you might expect: consumer products have an unlimited upside, while pro products are aimed at a niche market that eats up major resources.
Didn't Steve use the term "pro" simply to reduce all of the hundreds of Apple products into 4 quadrants on a graph because when he returned to Apple, it had a ton of crap under development? Meaning he just wanted to focus on 4 products - a computer for consumers (iMac), a computer for professionals (Power Mac), a laptop for consumers (iBook), and a laptop for professionals (PowerBook).
He only used it as a way to differentiate a certain core group from the regular consumer market. Why is Apple just throwing the Pro moniker around at everything now?
https://www.engadget.com/2013/08/12/steve-jobs-once-considered-abandoning-the-pro-market/