As im sure you know (and sorry for teaching grandad to suck eggs here, but i think it's useful to note for others reading), voting strength slider at 500sp is only a function of condenser (steemit.com). Proof of this is in that I gave this a 90% upvote with my piddly SP level using www.steempeak.com. I believe busy shows the slider for any SP value too.
I'd have given the post a 100% upvote if you'd mentioned this ;)
I had mentioned this in Part II, but opted to edit that out for this one to keep it simple and focus more on the changes. But yes, it's an important detail.
I believe I didn't mention this in Part I because the threshold to get that slider was 100,000 SP in 2016.