There's an argument for it but it's not as obvious. AAA numbers aside, Rowdy Tellez is not really a good prospect and not somebody that you ever make roster room for.
It also depends on the player... if Smoak is content and happy in Toronto, they might want to sign him back for 2020 on a cheap deal to plug the 1B hole, or at least keep the option open, so releasing makes no sense. With Galvis there seemed to be some consideration for the fact that his starting spot was gone and a "contender" would probably claim him and he would prefer a heavier role with a "contender". But who knows, maybe they will cut Smoak loose to maybe save some coin.
I just find it funny that guys like you, who are obviously not stupid, will do these mental contortions and throw lines like "Tellez is killing AAA" into some weird justification for releasing Justin Smoak as some sort of weird parallel in order to get their panties in a knot about Freddy Galvis leaving town for nothing. Jesus! Shapiro and Atkins need to hire some better PR because this fan environment is stupid.