I would say it's okay, if you added a lead release system. Obviously there's no adjustment, but if your using it for the same purpose every time then that's okay . I've used the Fox submerge in 45lb instead of lead core for over 12 months now. It's robust in the abrasion resistance department , and follows the contours of the lake bed nicely. I would have no quarms reverting back to lead core. Leadcore is as safe as the angler is sitting by the rods using it. In this I mean using it responsibly with proven safety systems and not using it in a snag fishing situation or long range casting where a crack off could occur.
Korda have it covered in the safety department with their no trace system and the Heli Safe lead release . Costs a fair bit but what price do you put on the safety of the fish.