[masukomi]

not saying those papers are wrong, but 136 years and millions of speakers from _most_ countries and Esperanto's speakers seem just fine without adding irregular verbs.

[eru]

Turkish might be a better example: it's a real, natural language and highly regular.

[nine_k]

Same with Japanese, apparently a completely unrelated, differently structured language.

[majewsky]

Fun fact: A subset of the linguistic community conjectures that Japanese and Korean are part of the same family as the Turkic languages. https://en.wikipedia.org/wiki/Altaic_languages

[nine_k]

Yes, but it's a really remote relationship, if it exists.