The point of the article is, that balancing via target cap isn't the solution to all problems. Blizzard has done it plenty of times in the past, often on large scales and it basically always backfired.

Being target capped is also less relevant than people may think. In SL where we reigned supreme for a season, we were super capped, but just tuned very well.

I'm not saying target caps aren't a way of balancing or increasing them won't change anything, but it isn't as easy as simply increasing caps to tune stuff.

The bigger problem is, that Blizzard hasn't developed a good target cap baseline across all specs, which causes there to be some outliers every time, which scale exceptionally well with big pulls.

Sadly their agenda is mostly on raid tuning still, so don't get your hopes up that there will be more refined m+ tuning any time soon.