The export-resources equivalence can be tricky to assess. I made an effort a while back and some proposals at the end.
To those I would only add giving Porcelain Tower access to producing XP and Export as a single resource, as you can do with the rest. For balance, the math should be done by taking the distribution of resources when you task it to ‘‘all resources’’ as a reference, then amplified to its equivalent.
If devs disliked the tempo from Tea Export, maybe these other options should be considered to keep multiple options in playstyle alive. @vividlyplain