Echo JS 0.11.0

Just a minor note... You probably want to stick to the most recent 100 entries by last modified date and let any search engine navigate/remember the rest.  Inflating the sitemap too big can work against you.

You might very well be right, the best practice doc from Google doesn't mention anything about it though (https://webmasters.googleblog.com/2014/10/best-practices-for-xml-sitemaps-rssatom.html)

In what way would it be bad? Because of increased document size?

Mainly in that maintaining it can become an issue... also, if you exceed a certain size it won't be indexed, so you'll have to reference other sitemap files, and/or generate them.  I've found you're far better off ensuring only the recent endpoints that are updated since the last google scan are about best.  And even then, google (and bing) will do a good job at natural discovery.  The sitemap really only allows for those sites with frequent publication to be checked more often by google.  If you are doing less than a couple posts a day, there's very little reason to worry about it.