I agree with you there, Monica. Where I live whenever a pianist comes along, say Perahia, what is the Programme? Never a mixed one! No no no!! Not Mozart, Beethoven, Schubert and a little Schumann, as it was in days of yore, but if it is Mozart, it must be an all Mozart concert and in order of K's: Sonatas K 330, 331 and 332, interval, Sonatas K 334, 335 and 336, and as an encore the Fantasia in c major. (Yes, I know those K's do not correspond to sonatas, but I give but an example).
It reminds me of my father's comments when seeing that some pianist or another was playing all of Chopin's 25 preludes: "Now, imagine losing count at Prelude 5".
For myself I can say I like Bortkiewicz and I like his Lamentations and Consolations, but when I tried listening to the complete set... My, how I was bored by the time they finally finished.
It is the ecyclopaedic approach to music.
I agree with you here Richard. One of the pianists I studied with was a "genre" specialist. He performed the Chopin 24 Etudes for his Bachelor's Recital. Since then he would often perform all the Etudes of Chopin, all the Preludes of Debussy, all the Chopin Scherzos, all the Chopin Ballades, etc. There is truth to the phrase, "Too much of a good thing."