Quite curious that you mention piano concertos. I can understand the point about solo piano music. In this form I prefer large-scale works like sonatas, variations, suites, etc, but little-tiny pieces like, say, 36 preludes, 26 small pieces, 18 dances... 
I don't find them substantial as a whole.
I think that the piano concerto is less problematic, due to the depth brought by other instruments. I confess that some of my feelings spring from my gut, and need tempering with maturity, patience, exploration and curiosity. The piano can obviously be utterly incredible, but I have less enjoyment of virtuosity than I do with strings or wind instruments. I was put off dreadfully by two Marco Polo CDs of Godowsky's piano pieces that as a keen young man, I thought might be interesting, but nearly killed me as I tenaciously explored in the hope of learning something. That poor experience has coloured my thinking unnecessarily, but ripples persist. I doubt I will ever really take to music that centres solely or primarily on the instrument, but never say never! I would be naive and foolish to allow the past to determine the future.
Rach 2 and Henze 2 (piano concertos) and Bax Piano Quintet are exceptions to the rule.
I am still learning.
Indeed. And in that spirit, I do not find the thread upsetting at all.
I agree also. I rarely allow anything to upset me nowadays. Difference is great, even passionate difference. Apart from politics and culture wars. They wind me up massively if I let them. So I don't.
