In saying that you are implying I hold the opposite view but I must point out that it was you who talked of replacing some parts in your amp with better ones. How did you know it would sound better without hearing it and listening with your ears? Listening with your ears can take you in many directions, not just the few well trodden paths that the commercial designers favor.
Yes, there is always taste involved but this is not an statement that directly relates to any superiority commercial amps may have over hand built custom designs. Some people like Apple's iPod headphones but that doesn't mean they're as good as HE90s or some home made electrostatics.
If something sounds good but doesn't measure well then clearly they're measuring the wrong thing. Most likely because they want to sell you something. Some older amplifiers designs like those you describe sound really good but how many commercial vendors are building amplifiers using those old circuit topologies? I think you may be surprised to find it's not as common as you think even with tube amplifiers.
Also, loads of reviews of caps, resistors etc. can be found on the web to give you a pretty good idea of how they sound.
I am still satisfied, it opened up the system completely and i have twice as much detail as i had before. now, that cannot be a bad deal.
So, what i said still stands.
You don't have to convince me of custom build parts; in my modded amp alot of custom parts were used.
The only new revolutionairy technology would be class D! And it is hardly used/fully explored. You need filtering in this design.