If there aren’t safeguards.
From the info available, it sounds like a horrible idea. First, It works off default max GJ instead of max inventory of the planted item so if you’re ever close to inventory overflow it’ll be a costly mistake. It’ll take longer to use based on having to calculate if you’re near max inv and which number of GJ uses gets you close to not wasting a drink. You’ll waste a lot of seeds/items/GJ and any silver you could’ve made for selling the items if you guess wrong.
Second, especially when you use Mega seeds. Usually 3 GJ maxes out inventory and if you have it set to max or chose a wrong number, you’ll have wasted a lot. (Unless there are safeguards set that aren’t described yet) I would’ve rather just have a button that does “harvest. Plant. Grape Juice.” That would be more of an improvement than this. I would rather click, what is it, a max of 22 times than have a one click that’ll waste so much inventory/silver if you miscalculate. I know this from the pig slaughter days, where I’ve accidentally sacrificed an entire row and received bacon more than I can hold. But that’s only a once every 6 months type of mistake whereas this will be a daily meticulously calculated usage per planted item.
If I’m wrong please put out better description of this new building.