High speed neutral coasting

[kk2002s]

I do put the trans in neutral and coast at speed when the situation is there and it's a longer downhill run.
Typically it is when I'm following someone and they're going to slow, so if I remain in gear, I'm doing a lot of engine braking.
I think prolonged engine braking is a bad thing.
I have also done it on long downhills to cool, bring down the temp. It works. It also gets some RPMs out of the auxiliary items (Alternator, power steering)

Trade off is that you do have to brake more especially following someone

I don't do it to save gas.
My main motivation is either cool down and reduce RPMs on the auxiliaries
OR
Not do prolonged engine braking

Is this bad for the Trans/Clutch what ever??
I know it's bad for the brakes but they are cheap, relatively