It was an audacious collection at the time. Great detail, lots of microphones, lots of Gigabytes... At best I can play it for 10 minutes, before I feel miserable.
I revisited the EWQL Pianos Platinum over the past couple of days and arrived at the same feeling and conclusion as you. I tweaked the settings and mic balances for a couple of hours and nothing I did could change the misery of improvising on them. At this point I'll archive them to a 7200 RPM drive because they're wasting space on an SSD.