Yeah it all looks great, the loss is not very important, and the seeds will all be healthy and viable which is what matters. And you'll smoke whatever the plant had left over for cannabinoid production :)
But the purple is a sign of distress and discomfort. It doesn't make the weed taste like blueberries, as teens smoking out behind 711 think, and it contains less THC than it otherwise would have. But for someone using chemical nutrients, the downside is very little. It would matter more for someone like me or loonatic who don't add nutrition aside from what's in the dirt. We've only got so much to go around, so any lost to purpling can be noticed. If I were doing seeds organically the way I do it, I would have to avoid any such loss. There may be other organic growers out there reading my comments.