I am. using LR 11. 4.1 and LRT 6.1 and having absolutely no problems whatsoever in any phase of the process. I'm always afraid to upgrade if everything is working well for me. Do I really need to upgrade at all?

I wouldn't be releasing updates, if there weren't important fixes. Of course I can't force anyone to update, but I recommend it. And I can only give support for the latest version, if needed.
In the blog you can find, what changed in the individual update.
https://LRTimelapse.com/blog