Heater core pondering
 

Heater core is just hot water from the engine yet it instead of rejoining the rest of the coolant path at the back of the engine it goes to the front engine assembly.
Bypassing any cooling as well as other extremely hot components.

Leaving the engine assembly part out of the equation would it not be beneficial to have the heater core rejoin at the back with the rest?
Shorter pipes, not near other hot stuff, actually get cooled off.
I realise warmup would be slightly slower as all coolant would be cooled.

How mental am I?

You have failed to consider flow.

correct, in your proposed routing there would be none, as the coolant would be coming from and going to the same path, so it would just stand.

you can however delete the heater core

So the only reason the heater core flows upon return is that the pump is so close. Thats annoying.
Living where i do I need three months of heater on average. Commuting would be far less pleasurable without it.

Seems bad to have the heater core go passed the stupidly hot exhaust and turbo.
Never mind.

I'm not forgetting the heater core is meant to be hot that is how the cabin heats up.

My issue is the return pipe being further warmed and not entering the cooling route.
I realise that is the raise the overall coolant temperature faster so the oil is warmed more efficiently ready for use.
This however given the drop in temperature across the heater core is basically pointless.
Ideally I would pipe to the heater core then to the radiator without an split of flow but the bore size is far smaller so without getting a customer heater core made thats out.

Guess a delete is more sensible then if i need it i can use a lighter powered heater.

No way. It runs under the manifold after the heater, so no way is it going to heat people in the car faster than the engine is heating the coolant. Seems to me to be a 'kill two birds with one stone' move: 1 move water from back of head to keep temps around No4 under control; 2 keep occupants warm (when HVAC turned to 'heat'). If they had simply used the FWD cooling flow they would not have had the No4 heating problem in the first place, but they didn't so they had to so something about No4 getting hot.