Smyly was struggling to a worse degree than the RHH on the squad, and Wicks is a better caliber prospect who has been set up for success with extra rest that probably would've benefitted Smyly had it been given to him. Also, since Wicks was called up Smyly has pitched fine with 5 IP, 2 R, 7/1 K/BB (most of that coming in a post-opener start situation) which really underscores that reactionary changes because you're frustrated with a guy's recent performance is not a great path to optimizing performance. This type of thinking would've had us throw away Merryweather, Madrigal, Fulmer, Seiya, Morel, and probably others at various points in the season for a shiny new option from the bench/Iowa, and they'd be much worse off for it.