I see, I will avoid playing this then. Thanks for answering
I believe that information is incorrect. You have to specifically allow for any sharing content with the girls and the customers by giving them a specific item. If you never give them that item the story and game still progresses, just without the sharing. You don't need to share to unlock any upgrades other than the upgrades related to sharing. For example there's a cafe gloryhole you can unlock. If you never give the girls that item greenlighting the sharing, you will never access that upgrade.
It is true that there is a lot of sharing content on its own, but you just won't get those scenes. There are still pure harem only scenes with the MC and the core main story revolves around that anyway. The sharing with customers is all side content.
As for the grind and management, it would take an extremely long time to actually play this game normally in terms of grind. Days and days and days of playing properly to do it the normal way. Most people here just edit their save files to unlock upgrades, money, and alter stats and the like.