Can I make endless parallel li-ion connections?
There are two reasons you need to be concerned about the number of parallel cells in your battery pack

a) The current cutoff threshhold when doing the final CV charge is dependent on the battery capacity, which is dependent on the number of parallel cells. You simply need to know the numbers, and program your charger correctly.

b) In the event of a failure of one cell, the other undamaged cells in parallel with it may discharge into the damaged one, prolonging and exacerbating any 'vent with flame' event, turning a mess into a catastrophe, turning a damaged battery into a damaged vehicle or building. I talk from experience, my brother lost an eBike and the van in which it was being charged, and would have damaged any adjacent vehicles as well but for being parked in a remote corner of the carpark.

You can mitigate this latter problem by connecting a fuse in series with (ideally) each cell, or at a minimum with each small group of parallel cells. The smaller the group of cells, the closer it can be fused to protect it.