Wade, I agree. I've said this a couple times on here recently: we are so spoiled with Mahler recordings now that we nit-pick wonderful performances like this one (I'm a main offender of this, of course).
We've gone so far to the other side of interpreting Mahler symphonies with Vänskä's approach that, in my opinion, after his and Á. Fischer's cycles are complete the industry ought to really just cool it with Mahler symphony recordings. We have too much now. You're right: Mahler is the 'meat and potatoes' of orchestral music now, and too much meat and potatoes leaves no room for 'dessert,' or even gives us a chance to enjoy our 'appetizers.'
There's literally Mahler for everybody now. Do you like your Mahler quicker and lighter? Go for Kubelík. But do you want modern recording sound? Go for Stenz instead. Do you like your Mahler slow and heavy? Well, my friend, you have three Maazel cycles to choose from. Do you like your Mahler cold, calculated, and balanced? Go for Boulez. Or do you like it with heart, warmth, spontaneity? There's the early Bernstein, or the late one if you want extra drama. Do you like a modernist approach to Mahler? Check out Gielen. Or are you after state-of-the-art recording quality? There's always Vänskä, Zinman, and Nott. Or perhaps you want the highest quality of performance? There's both Chailly's and Jansons' RCO cycles. But maybe, just maybe, you want it right in the middle of everything, totally neutral and checks all the boxes... well good thing we have Bertini, Haitink, Jansons' BRSO recordings, and even folks like Ozawa and Edo de Waart.
Yes. We are absolutely spoiled for choice now. Like you said, where are more recordings of the lieder? Das klagende Lied? That's a fantastic piece that no one pays attention to because it's overshadowed by the 10 or 11 symphonies. When's the last time we heard a beautiful new recording of Kindertotenlieder from a top-rank soloist with the Berliner Philharmoniker? I don't even recall a recording of Das klagende Lied from the Berliner Philharmoniker or the BRSO. Or the RCO. Or the NYPO. Or the CSO. Or the BSO.