apart from the problem of excessive transmitting power, I think that the problem is also the aesthetics of the conversation. I remember beautiful technical conversations with three or four correspondents who intervened in real time to comment on an aspect of the topic under discussion. The discussion is more vivid if the correspondent can ask for a clarification in real time.
If you have to pass only the locator and 5/9 then you can go in simplex.
my two cents