Several reasons why you will remain disappointed.
There is no such thing as "proper", just preferences.
Amp manufacturers will only make what they can sell. D class plainly outsells SS and valve so that is what they will make. You won't find valves in PA systems or recording studios, so while some remember the good old days, the majority of the bass world is moving on. All early adopters have to make compromises, but the development in D class design means that these are the amp of choice for most players these days.
Both SS and D class are not trying to be anything other than what they are. I remember when you had to take your pick with valve amps. Some were good but many were terrible. I don't go glassy eyed for valves, I listen to the amp. There are good and bad in all categories.
You don't have to be disappointed. Valve and SS amps are still being made. Buy one of those and be happy.