I just enjoy making changes, personalizing and spending money on components that Honda bean counters wouldn't sign off on. I've no doubt Honda engineers would install them if allowed but it would make the car much more expensive in the first place. That prices makes them cost $3000 a set. A price Honda couldn't pay, but I would. I'm not planning to ruin the car, but I do like to make it my own by adding choice modifications outside the realms of Honda's design brief, cost,mpg and emissions regulations.
I think it's very simplistic to say that engineers/designers have these great features they want to include in a car but there's a group of "bean counters" in a dark room saying "no it costs too much, use a cheaper/inferior part."
Cars are positioned in the marketplace against competitors in that market segment. Price and the performance offered at that price point determine the value.
If a manufacturer like Honda decides to position the NSX against similarly performing Porsches or an Audi R8 then the cost to Honda of that NSX has to be at a level that allows them to profit at an MSRP in line with those competitors.
It's nothing to do with an internal debate between stern cost accountants putting the kibosh on the certain turbocharger that a keen young engineer wants to install on the engine. All the components need to add up to a certain cost point.
Honda could build an NSX that could run with anything on the road but if the price point was at P1 levels few would buy.
I understand wanting to modify a car with a certain part to "make it your own". Bolt on body parts, carbon fiber trim, different wheels is a big business.
I think what's different in the new multi power source cars is the balance between the electric power output and the gasoline power output will be integrated into the control system.
The minute you change, say, boost to yield a higher max power output, you are changing the torque curve of part of the drivetrain. At this point you have no idea of what effect that will have on the electric output and it's effect on the total output of the driveline.
Raising peak hp at a higher rpm in the gasoline engine could result in lower torque in the midrange and lower overall performance despite a dyno saying peak power is up.
Adding a high priced turbo and boost to a single power source car is much like adding a hotter cam to an old muscle car engine. Easy to do with good results.
I guess we'll see who is going to step up and modify the drivelines of a P1 or a 918 but I'll bet it's not as simple as you think.