Default bullet lists (or numbering lists) are controlled by
Bullets & Numbering. The tabs of insterest here are
Customize (for general aspect) and
Position (for indent and alignment). Once you’ve customised, never again selct anything in the other tabs: these tabs are quick’n’dirty shortcuts for the settings in the last two tabs. Clicking on any of the proposed arrangements will set various parameters and ruin your carefully crafted configuration.
Concerning the renaming of the list styles from List n to Bullet x or from Numbering n to Numbering 123, Numbering abc, …, I consider this is a clarification and an improvement against user confusion. In previous releases, you had paragraph styles names List n and list styles similarly named List n. Identical names are not a technical problem because they live in different namespaces. But, users (and I first) tend to think that styles with identical names are associated, which they aren’t.
Why would developers impose on you a choice of specific bullets for List 1?
Also, most disturbing, despite their names, List n do not format lists until you link the paragraph style with a list style.
You can perfectly legitimately associate para List 1 to list List 2 and vice versa. This cross association will confuse future maintainers of your document, even you a few months later.
Thus, I think that retaining a more or less descriptive name for the built-in list styles is a good change. Remember you can always customise the built-in styles if you are not satisfied with the defaults.
Now, your approach of storing your preferred styles, including list styles and paragraph styles linked to list styles, in a template is good (and right?) and sensible. Your template should not be impacted by the change because the change in in the default template. At least mine crossed the change undisturbed.
The seem to use style extensively. Keep on doing that. At most, it involves an update to your template if it didn’t include the list styles. Refrain from using the bullet button icon: it will create a direct formatting condition which can’t be removed/acted upon from the styles. This is very important for elaborate, complex and long documents.
To show the community your question has been answered, click the ✓ next to the correct answer, and “upvote” by clicking on the ^ arrow of any helpful answers. These are the mechanisms for communicating the quality of the Q&A on this site. Thanks!
In case you need clarification, edit your question (not an answer) or comment the relevant answer.