I have not installed 2019 R1 and see that the Migration tools have changed. Some of the features of the prior version seem more flexible than the new version. The video on the new version only shows Survey Features and does not clearly explain where many of the columns of required data needs to come from or any sort of suggested best practice is. The earlier conversion tools had more in depth videos that explain things better.
So, is there any reason we can't use the older tools, or is there some explanation that can be used to explain and convince us to use the newer tool?