This might just be me, but my Synths are usually maxed except for my Hunter (which is my least used class). So are you bent on unlocking everything or do you only unlock when you are going for fashion?
I have never felt the need to spend money on Synth Templates, or I am never without some to use for my characters.
Though I am not against there not being a cap on the seasonal quests you can grab from Ada.
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I only unlock stuff if I want to make a specific look and need something. You can always preview the stuff before unlocking so no wasted synthcords.
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Same. Synth bounties are pretty fast to complete as long as you know where and what to do to speed em up.