I am sympathetic to the "different communication style" line of reasoning, but I don't really buy it in the example I used / people I work with at present.
As far as I'm concerned, responding to some well-prepared prose with "lets discuss this", is just a non-response, and a refusal to engage. If one wanted to have a useful discussion, but preferred something verbal, actually picking up the phone, or responding with something like "I'm curuous about X/Y/Z. Let's discuss this at 2pm, I'll send you an invitation", or "please find some time in my calendar for us to look at this."
That would keep the matter progressing, and provide the opportunity to prepare for a useful discussion. "lets discuss this" is just saying "I need you to spoon-feed this to me, but I'm not going to make arrangements for that, so you'll need to figure out how to deal with that.".
As far as I'm concerned, responding to some well-prepared prose with "lets discuss this", is just a non-response, and a refusal to engage. If one wanted to have a useful discussion, but preferred something verbal, actually picking up the phone, or responding with something like "I'm curuous about X/Y/Z. Let's discuss this at 2pm, I'll send you an invitation", or "please find some time in my calendar for us to look at this."
That would keep the matter progressing, and provide the opportunity to prepare for a useful discussion. "lets discuss this" is just saying "I need you to spoon-feed this to me, but I'm not going to make arrangements for that, so you'll need to figure out how to deal with that.".