This is not an area where I have a lot of expertise but I do recall someone else explaining why PL doesn’t embed an sRGB ICC profile - in this post here:
Assuming the post is correct then, strictly speaking, any issues arising downstream from PL6 due to the lack of an sRGB ICC profile would appear to lie with the downstream software. It’s a separate question as to whether PL6 could (helpfully) embed the profile to reduce the incidents of such issues.