Yeah the MillCreek isn't like at the level of Aphogee so it can be used more often but because of the high protein content, it doesn't leave my hair particularly soft with slip. I get very strengthened/durable hair with it. I like it a lot, when my health store doesn't have it in stock I get mad.
This may sound weird but I had more of a problem with midshaft splits. I would get them from using the comb attachment from blow-dryers. Started air-drying and with trims, got rid of them. Now I'm back to blow-drying again but I use my own wide tooth comb and a nozzle attachment to blow-dry in sections. So that solved the problem.
Uhm, I have suffered from thin ends and splits before but only when I would be extra lazy with my hair. I get my ends trimmed really well and if I see any thinning or splits, I snip them off so I never have a chronic problem with them. There was one time though that I was not washing or combing my hair for a long time, just putting it in a bird's nest of a bun and expecting my hair to cooperate when I was finally ready to wash
without detangling first. I was also deep in a stretch, going through a breakup, had exams and used protein on my hair when I wanted to wash. Yeah... that was a lot of abuse and stress for my hair and gave me a setback. Happened during a very stressful period so I don't blame myself, was a teachable moment. Overall my hair doesn't need a lot to retain and look good, I'm very hair lazy and my hair actually likes my low maintenance regimen but there's a difference between neglect and low maintenance.
I would say if you're having trouble with thin ends + splits, you should keep your hair very balanced and try to trim lightly by using the search and destroy method. Any time you notice a split, snip it off and use that time to clip off the bad ends, Keeping hair protected at night also helps tons.