On the flipside to that, there's Pianoteq 6 who do physically modelled pianos. After going through several sampled piano libraries I settled on Pianoteq as my "forever" piano VSTi. It's less resource intensive than the gigasamplers and "feels" more playable and expressive in a way I can't rationally explain.

(It helps that some of my favorite producers and composers have used Pianoteq - for me that's Guy Sigsworth and Thomas G:Son, but the Ludovico Einaudi endorsement really clinches it for me.)

https://www.pianoteq.com/