No it shows Yoshida doesn't really understand one of the problems. His responses show this lack of understanding over and over but instead of trying to understand the job and its problems he pushes back on the players as the issue.
With Exhibit B Yoshida is getting hung up on discussions of ways to resolve the lack of pet healing and confusing that with other types of healing. Sustain was the pet heal and was removed as near as I can tell based on someone's gut feeling. We were left with the useless heal of Physick. We have been saying we need a method to heal our pets. One option is the return of Sustain. Another is for Summoners to base Physick on INT so it has sufficient power to heal the pet. Yet another suggested a two level Physick where it is only more powerful for pets and stays its anemic self for players. Personally Summoners don't need a player heal. All we need is a way to maintain our pet. To me the simplest and most straight forward way to do this is replace Physick with Sustain at level 30. But given how SE frequently does things in a convoluted manner some type of Summoner buff to Physick would also resolve the immediate issue with dead pets.
I had many years where I worked with my company's labs and programming centers in Japan. From that I found it was very important to be concise with problem definition and resolutions. Using the American form of scattershot brain storming frequently led to misunderstandings and tangents being taken. It had nothing to do with the technical competence but the way language translation is processed and understood. While I think SE has a definite lack of understanding of how the Summoner works I also feel some of the problem is the language differences resulting in a lack of understanding of what is being said in the forums. I don't know SE's support structure but I think some of this would work better if they had some highly technical native English speakers distill the conversations into product requirements.