I started my client's site on Hugo, withing 2 days I was editing something for them every 30 mins (slight exaggeration). They wanted something they could edit, they don't do Markdown, they don't manually write URLs they want to drag images into their posts and pages.
So bye bye Hugo.
This is generally solvable unless they wanted radical layout changes. There are headless CMS solutions, just ensure that no texts are hardcoded and instead put in a config. Such configs can be made editable in the CMS.
Normal people refuse to learn markdown - they want RTF editor.
I could understand someone might refuse learning LaTex but markdown is so simple.
RTF editing sucks badly if you have to include it in your project. No one wants to specifically pay for implementing it but they also expect it to be there.
Check out TinaCMS. Works for editing Hugo sites. Not as nice as WordPress admin, but it's good enough for simple editing tasks.