Does anyone actually think anyone will be using the same class d amp in 20-30 years? With the way the technology is still evolving, I find that bordering on pure fantasy. I see no reason why having something that is easily repaired (what can be easier than swapping out a module?) or updated should add significantly to the price.
@kuribo The flip side of what you're saying is that no care should be taken to make the amp easy to service and update??
Since you are not a manufacturer you won't be familiar with the idea that a customer might contact you looking for the 'last amplifier I will ever have to buy'. I've experienced that many times and I'm sure other manufacturers have too. Believe it or not, a certain portion of the market appreciates a quality build that doesn't look like a denizen only suitable in a mancave. Also, we have found that the ability to update and reactivate the warranty of any of our older products has the effect of increasing their resale value on the used market so it natural to have that same ethos apply to any newer products we make.
Amplifiers might change, but they will always need a power supply. So being able to update the amplifier with an improved module might not make sense to you, but it makes plenty of sense to our customers.