I totally agree that toyota is not naive when it comes to designing these things, and 30 years of life is great for a heater hose. But this is a mass produced vehicle. On an assembly line, the engine goes in as one piece. there is no time to be fooling around with routing a heater hose around...
aluminum outlet and inlet do not need replacing unless they are deeply pitted or leaking. I'd recommend doing all the firewall heater hoses, the throttle body coolant hoses(3) and water bypass outlet pipe orings (3). Your pesky heater hose part number is wrong. I recommend doing the bypass but...