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.

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

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

The comment specifically said it wasn't complex technology, but that pipe the bidet connects to is complex technology.

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.

Look, if I'm going to blast my ass with water it had better be at least luke-warm.

Nah man the cold water is a refreshing wake up and a welcome guest after those spicy dumps.

Even in a Michigan winter, mine never gets uncomfortably cold. Water pressure varying seemingly at random is more annoying.