Instead of a technician coming and do the job for you (ideal) or somebody giving you the instructions and the tools for the job (not ideal, but doable), you are just given a box with all the parts of a new piano, completely disassembled, all single keys and all single parts of the action for that key, and all individual strings that you need to attach (and you have no idea how many strings per key and in what order) and only very vague instructions. To make a comparison with the acoustic piano, image you want to play the piano, and maybe have the instrument voiced a bit darker (or brighter). It's a lot of time and a lot of effort from the user perspective. HOWEVER, for someone who wants just to play piano and not mess us with stuff that sound engineers do, I strongly suggest to stay away from it. If you are into that kind of stuff it's certainly great, given that many people like you wholeheartedly recommend it. You can create track templates loaded with FX that you can return to with a click of the mouse. It loads as quickly as Pianoteq standalone. It can also be configured for live performance. So at risk of sounding like stuck record I suggest anyone who would wants this takes a look at Reaper, it's so very fast and lightweight. I imagine they might regret ending up being responsible for troubleshooting all the 3rd party plugin compatibility issues.

I like the idea too, if we take compatibility issues out of the equation.

Pianoteq 5 large room effect