Earlier quoted context omitted.
They get a notification if they have chosen to receive notifications. It's not like the sender forces themselves upon someone else.
Now on top of annoying them, now you're dictating their phone settings too? What if they don't want to stop notifications? What if they don't know how to do it? What if they want to still get one from the child or partner or friend who's travelling if anything happens to them? Should they turn it on and off for your convenience, lest you have to forego sending a non-essential text at night?
if they don't know how, the first time they bring up this issue, i'll help them change their settings.
yes, there are always corner cases, and there may be a situation where it is necessary to avoid sending messages at certain times. but this can be communicated. what bothers me is people getting upset if they receive a message at the wrong time as if it was the senders fault.