I don't think that trackpoints are the best in every case, but they're hard to beat in situations where space is at a premium and you don't have the space to properly operate a trackpad or mouse (e.g. airliner seats). So personally, I find them of more value in an ultraportable than I do something bigger and more performance-oriented.

They're also pretty great for controlling a computer from the couch, way way better than the horrifically bad trackpads found in most keyboards made for entertainment center usage. For this reason I have a ThinkPad Keyboard II hooked up to my living room PC, and as a bonus the keyboard's switch between Bluetooth and an RF dongle makes it easy to switch over to a PS5 with the dongle plugged in for the odd occasion where it's useful to be able to type on it.