Using Price here was beneficial in 3 different ways, first it was throwing in your hard throwing ace after seeing a knuckle ball for 4+ innings, and more importantly, it kept everyone on proper rest/rotation, and provided Price with an opportunity for a confidence boost while avoiding another blow up in Game 5.
Look at it this way, from a rotation pov, if you save Stroman and Price for Game 5, neither could pitch until Game 3 of the ALCS.
Now look at it from a rest perspective. If Price starts Game 5, Stroman pitches Game 1 on 7 days rest (may not be as effective). If Stroman pitches Game 5, Price pitches Game 1 on 8 days rest (has proven to not be as effective).
With today's move, Price and Stroman can start Game 2 and 3 in order, on their regular 4 days rest each. It's a great move and anyone questioning it doesn't see the big picture.