Yea 100% agree. Having to manually adjust lighting intensity by PI is kind of… weird imo.
I must say, if this was the case when I knew absolutely nothing of 3D programming when I first started, I would probably be very confused. When I first used three.js it was straightforward enough that a complete newbie to 3D like myself could learn it easy enough. I question if I would know right off the bat to multiply light intensities by pi to get correct results. This just feels wrong.