Its not really a headache to have an athletically limited, weak overall player (dragged down by lack of defense) who has utility (Yoshida isnt useless he works counts, controls the zone, makes contact) on your bench. The headache is a) bench players usually provide acceptable coverage at a position/usually mutliple positions which Yoshida probably doesnt at present (I still think he should learn how to play an adequate first base to increase his utility as a bench player) and b) Yoshida is overpaid for htis role
BUT....depite not being an ideal bench player for those 2 reasons (not a lot of positional backup cuz Yoshida is almost a backup DH AND makes more than youd want from a bench player)....Despite not being an ideal bench player for those 2 reasons, Yoshida does provide hitting depth. Any injury to an OF, he becomes a DH and probably a close to average one vs one that cant hit at all....AND hes solid as a pinch hitter. Imagine DHAM is up with the bases loaded in the 7th? Yoshida coming in , knowing hes going to give you a legit at-bat. DHAM is an automatic out and he may get some starts. Ditto Mayer vs lefties. If in the 8th , they bring in a lefty against Mayer in a close game, you have a second counter move with Yoshida (if Romy already in the game)