Newer water physics

I somehow thought why the player has the power to create endless sources of water with a bucket? maybe it will be better if the player can not make endless sources, but create flowing water. I mean now the water will be more dynamic. Make it as in reality - you will pour some amount of water that will spread over the square. For example, imagine a swimming pool in four blocks. if you pour water into it, the water will fill one quarter of all four blocks, that is, to fully fill such a pool, you need four buckets. Let's consider another example: let it be an empty rectangle in the middle with a height of 20 blocks. if you pour water with a bucket on 20 blocks, the water will flow down and will not remain on 20 blocks as it is now, but only on 1. you ask me, what to do with reservoirs? if they are made with such physics, it will put an enormous load on the system. therefore, I propose to leave these reservoirs endless.