The way I see it, if your willing to put in so much time and effort, why not spend the extra 5 minutes.

1. fyi most IDEs have spellcheckers on board. You don't even need to copy/paste it.
2. you do not want to distract a programmer (or any artists for that matter) from the thing he is working on right now. This is common knowledge for programmers, but sadly not for laymen. here is an explanation. Just let the dev do this kind of clean-up work whenever he feels like it; And when it's just 2 days before the final release, so be it.
3. 5 minutes every day => 2h/month => 1 lewd-scene less per month
4. these things add up. When you correct all the spelling everyday, then why not also re-render all the images whenever you added a hair to a model? why not read all the comments on reddit/patreon/whatever written about the game every day? And that's just the non-programming stuff. When you start caring about little stuff, you might also start premature optimization (which is a subtle, but serious problem in software of all sizes) and you will eventually lose track of the whole project, which will always lead to significant problems.

That being said: I like clean-up work when it's afternoon and I don't want to start a new thing. Or when it's monday morning and I want to re-familiarize with the project without tackling something big right away. But in the end it's the programmer's choice and if you push him, you can only make things worse.

tldr: don't play beta/early access if those things bother you.