George,
Looking at the two versions of the TT-50, the 2019 version looks like a genuine improvement. Over the years I have used the older version with and without the electrical ties. I have never experienced a problem either way. I do not doubt that others have experienced problems with the older design. To the best of my knowledge, the electrical ties solved the problem.
I have three older TT-50s and one 2019 version. I do not plan to replace any of the older versions, however, if I purchase any more in the future, I will stick with the newer version. I am not of any problems with the 2019 design.
Ken