Come on guys. If someone else knows what you are doing regardless of where you are that can be considered an invasion of privacy. I'm sure we are all capable of comprehending that.
Most of us, myself included just don't care.
Let me lay out an example. Messy breakup, ex partner text you, you start to text back but decide it would be better on a clear head. Now ex partner knows you read the text but doesnt know why your ignoring it. Same could be used for a co-worker, boss, family member, etc.
That's why my suggestion was to make absolutely sure you are ready to text prior to typing.