many people see it that way but others don't. Pep favours coaching than game time, a lot of the time. Look at Foden, Palmer, Delap, McAtee. No loans. developed in house and playing / training with their first team.
Doyle spent the second half of our season on our bench and being coached by our coaches when he could have spent it training with Laporte and Dias and working with Pep and his coaches.
I'm not saying first team football isn't important. But he's still crazy young. In a way he went on loan a year earlier than you'd normally expect. So he has time in the bank to get some coaching and maturing in before then going out to a championship club NEXT year.
I'd suggest he's not likely to start regularly for a championship club, and league one football isn't ideal for him. So they're better off developing him more in house then sending him to championship (or maybe even abroad) next season.