The Rays could have used Joyce at DH vs RHP and to back up both corner OF positions. He's a better player even than Josh Hamilton and has value, even if it's not star value. Zobrist plays 2b for them and wouldn't be competing for Joyce's AB's.
All players have some value, that goes without saying. However, Joyce is 30, can't hit lefties at all, and showed a decline last year to only 9 hrs in 418 ABs and a poor line of .254/.349/.383 (ugh). So he's not better than a healthy Josh Hamilton, and the Rays could do a lot better at DH. Also, the Rays want to give Forsythe some ABs at 2b, so Zobrist will get some time in the Of, making Joyce even more expendable.
Jepsen did have a nice season last year but 30 year old righty relievers with career ERA's around 4 who have never thrown more than 65 IP in a season, typically less, do in fact grow on trees. Most fungible commodity in baseball.
As I said before, In Jepsen, they get a hard-throwing (96 mph), set-up-caliber guy who had a 2.63 ERA, 1.05 Whip, and a whopping 10.38 K/9IP in 74 games. That type of quality reliever does
not grow on trees. If you think they do, then go make a list of all the MLB righty relievers of such quality and performance level. You won't find many, and those you do will all be valuable. Also, even if such righty relievers
are fungible--and you haven't proven they are--it doesn't mean the good ones aren't rare and valuable. Ones like Jepsen are.
Jepsen is under control for one more additional season than Joyce but that demonstrates that the Angels and Rays both acknowledge Joyce to be the better player.
That conclusion doesn't naturally follow at all. You're taking a leap of sylllogistic logic not supported by your facts. Sometimes the need of a type of player trumps the need for more years of another. It doesn't prove one player is better than the other, or that either team thinks so. Also, the fact the Rays get two years of Jepsen has value in itself. Not only did they get a player of equal or better value whom they needed more. They got one more year of him. Pretty good deal for the Rays.