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)
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.
So? We're not talking about putting in plumbing for the toilet, we're discussing attaching bidets to the toilet. Also, water piping in your house is not that complex unless you're just completely mechanically inept.
