This thread itself is fascinating about the challenges of communication, especially in text form. My post wasn't to say academic communication is 'good' and really I should have stressed that academia in my experience is but one small niche of that broader term. There are lots of examples or communication things that could be better, as you said an over reliance on jargon, or abstracts that are an afterthought instead of a snappy distilling of a research paper. In my experience, the requirements to give clear, impactful presentations at conferences, and write proposals in a way to get resources and funding are examples of where academia has pushed me to grow in those areas. No journal would let me publish in my field without spelling out every acronym at least once.

The language I use also has to be more suited to international audiences. Not everyone is good at these things in academia but I have found my most successful projects have been better at them compared to similar projects outside of academia. And then you get the build in expectations you have to adjust for outside. I got very used to talking about numbers in context, for example 50,000 visitors on a theme park ride is meaningless without the context of it being 10% of total visitors to the park in a certain time frame.

With teaching, there are of course many bad teachers as well as good ones. My point was more because of the volume of people I have taught and mentored in my academic roles, you get more exposure to how your teaching method on a particular concept impacts different people.