[bluGill]

You need water pipes from your water source to the toilet. That technology is a lot more complex than you give it credit for. Most likely there is an electric pump someplace in the chain, which adds in a lot more technology. (There is also water treatment, but since we are not talking about drinking water I will ignore that)

[DrThunder]

Every toilet already has a pressurized water line going to it.... it wouldn't be able to refill after a flush if it didn't

You literally just T junction off the line that's already present. Not complex at all. The bidet itself has a valve that stays closed until you're ready for it to spray.

[bluGill]

That has noting to do with how complex the technology behind our water system is.

[DrThunder]

What are you even talking about? Your responded directly to a comment about bidets, not water system complexity.