That's... exactly what this is about. Now you _can_ help it.
Unless you have a really explicit understanding with the person you’re texting, they’re gonna assume you expect a response, or just expect them to read the message.
You gotta know how your actions will be received; “I can’t help you” really just isn’t enough if you wanna be a kind and thoughtful person, IMO.
Ober time, this distinction has blurred due to technology changes and resulting cultural adjustments including immediate email delivery, voicemail and advanced messaging and notification systems.
And that change over time is causing some disconnects between expectations of good behaviour.
It’s especially appalling when they played this trick on my old parents, who receive a slew of emails every morning at 5 or 6am.
Having separate devices for personnal and professional stuff helps. I can't speak about iOS, I used it way too long ago but both Android and most messaging platforms do not provide ways to have flexible do not disturb policies depending on multiple parameters such as sender/timeframe/app/format of message. It is usually a mix of the global do not disturb function for the OS, the global notification parameters per app and possibly some mute options on a contact/channel basis but that is not time range capable and only works on a blacklist instead of whitelist model.