Could are tag excerpts and wikis use some love? Yes. But the changes we make need to be helpful and accurate. Don't edit for the sake of editing. I just voted to reject six of the tag edits you suggested in review because I didn't find them helpful.
Most of the excerpts I rejected because of a cyclical definition:
Tag excerpts amounting to, "[tag] is for questions about [tag]" are pointless and usually rejected. Excerpts should describe why and when a tag would be used.
Simply saying the termination tag should be used for "Questions about terminating employment" is not at all helpful to someone who doesn't know what termination means. Instead, excerpts should be short one- or two-liners that help to define a tag and how to apply. For example this tag could be
For questions about involuntarily losing one's job, such as being fired or laid off. Questions about voluntarily leaving a job should use the resignation tag.
You also changed the termination definition from being only about involuntary termination (aka firing) to being about both voluntary and involuntary termination. I don't know which version is correct for how we use the tag here (we also have the resignation tag for questions about leaving a job voluntarily), but if you are going to change the meaning of a tag, you need to bring it up in Meta first so the community can agree on a definition.
Lastly, you edited the wikis for two country tags to also include a list of links to every other country tag we have. These tags are not at all relevant and only add clutter to the wiki. Some of the "best-practice" tags you link to include a list of relevant tags, but they should be tags that are often closely linked to one another. Someone who uses the mac tag may also want to use the tag macbook-pro. Someone who uses the tag united-kingdom is not likely interested in tagging egypt as well. Someone tagging california might be interested in the united-states tag though.
Wikis should provide more information defining the tag, and possibly include some helpful links, but they should be relevant. Generally useful links might be to canonical questions on Main or Meta that apply to a certain tag (e.g. 1, 2, 3, 4). For tags which are only relevant to a specific location (e.g. country tags, relieving-letter, gdpr), it would be useful to link to sites on relevant employment laws and government agencies for that location.