Middle-click paste is widely used in Linux, and while I tried mouse emulators with limited success, it sure is good to have a physical button at your thumb. With a tiling window manager, you can copy (by visual select depending on the application) and paste (middle-click) without ever leaving your home row across multiple windows. This is a serious work flow tool in REPL.
Moreover the new haptic feedback they got on button-less TrackPads have motors etc which are not as reliable as million-click-tested ThinkPads' physical buttons.
Laptops are the tools of our trade, and unfortunately, we cannot make too many compromises, especially for the sake of trendy aesthetics. If ThinkPads want to be MacBooks, then we might as well buy MacBooks; indeed, many of us already do. Almost a decade ago, Lenovo already made a similar mistake with 2nd generation Carbon X1 (and some T series) and they had to revert back. Having a diversity in the market place is important, and I surely hope Lenovo keeps ThinkPads as uniquely performant as they have been since the IBM days.