Hansi had several rough periods and, thus far, each time he managed to bounce back. I think one of the reasons Blind Guardian takes large touring breaks is to keep periods of studio recording and touring seperate.
And I also think there are a couple of things that he does better than ever. Most notably is that his pitch is usually on point. Even in recent shows where his pitch is weaker, it is not to an extent it detracts from the show in my opinion (take the Hellfest Demons and Wizards vs Wacken, Wacken is better in that regard).
Also, compared to the classic era his English has greatly improved. I especially prefer the ballads nowadays because of that.
And in general he has gotten better with timing and emphasising words. It is something that many aging metal/rock vocalists struggle with and I really appreciate that Hansi does his best to convey words. Take the new song for example, I can make out most of the words clearly. And in regards to timing/emphasizing, I think Majesty on Live Beyond The Spheres vs Live (2003) is a good example (mostly minot differences, but I prefer the former, and offcourse that version is quicker).
And Demons and Wizards Wacken 2019 is probably one of my favourite Hansi live performances.