If you’re getting so much email you can’t type five words, a button with wrong suggestions isn’t the solution either. Create your own text snippets with text expansion software and use those. They’ll always be correct and will truly save you time.
let me try a different tack - 99% of the value is in the affirmation of the response and the demnonstration of responsiveness, not the actual content value of the 5 words. you could send a thumbs up emoji, you could send a ".", just the "seen" and "acked" value is the value of that 5 word button
Which again underscores the question of why we need an auto-generated response when a thumbs up will do.
Of course a reply is valuable, but are those options really saving any real time vs a quick single word acknowledgement, which is often faster than even reading and considering the options?