You're not silly, I love debating

I do believe this won't happen if a coolant is properly protected with an anti-corrosion inhibitor to the right ratio. From what I remember HydreX is taken from the racing boat industry, so it wasn't actually designed as such to be used in PC water cooling, but what has been apart from the blocks?

Radiators are designed to fit into cases and be efficient with the flow/pressure levels we use, but the concept of radiators has obviously been around way before PC water cooling.

Tubing again, we use vacuum tubing and beverage tubing.

I just think the ultimate of ultimate protection should have been using a material that isn't as problematic as aluminium if things go wrong. A safety net if you will.