Red Bull was essentially forced to develop its own engine after Honda announced its exit from F1, because neither Mercedes nor Ferrari would willingly supply an engine to a direct competitor, and Renault engines weren't even a viable option to consider.
Only after a few years did Honda reverse course and decide to continue, but by then it was too late, as Red Bull was already committed to developing its own power unit and couldn't simply throw away all the money invested to return to the arms of a company as indecisive as Honda, which might announce (again) next year they will leave F1.
In short, RBPT-Ford is a gamble, and Red Bull currently has no other option than to move forward with it. If it goes very wrong in 2026, begging for an engine from someone else won't be an option; they have to keep investing, developing, and see if it improves in the following years. If it's still rubbish, then failure can be admitted and return as a customer team.
The problem is that there's a spending cap on engine development. If the engine goes (very) wrong, they can't throw billions of dollars at it and redesign the engine from scratch like Honda did, because of the cost cap.
Therefore, I personally don't have high expectations for this engine, and I recognize that it will be a year of learning and maturing, during which the team's fans will have to be very patient.
