Another Kagi user here, yes, the customization of results is way better than any other search engine I've used. Eg, personalization can be manually set to lower or raise weight of results from specific domains. This has become extremely useful to not only filter out bad sites, but increase relevant results when you regularly get information from sites like GitHub etc.
Stats are released about these as well so you can easily copy heavy used fiters [0].
Stats are released about these as well so you can easily copy heavy used fiters [0].
[0] https://kagi.com/stats?stat=leaderboard