This is a valid approach, but it does have a problem: it can lead to long back and forth messaging/email exchanges, including lengthy messages.
I don't, generally, have time to write long messages, nor (often) to read them, so as soon as I see this happening I've started to point out the behaviour and set up a short meeting to resolve whatever the issues are.
There is no guarantee that a short meeting will resolve something that has already been the subject of a long discussion, though I will grant that long discussions are often the result of at least one party not paying attention to what the other is saying, and only the intervention of a third party can break that deadlock.
Having one party who only reads the subject line before replying will sabotage any attempt at resolving an issue through email.
I don't, generally, have time to write long messages, nor (often) to read them, so as soon as I see this happening I've started to point out the behaviour and set up a short meeting to resolve whatever the issues are.