Here are my rejoinder
First there is a lot of activity in the Honda and Hyundai/Kia forums where there is a group of owners who are actively contributing and sharing ideas. Yes they have a focus but there is nothing wrong with it. So there is a lot of non Tesla activity.
Second, there are people who are very interested in a brand and are always posting about it e.g. Mini SE. So if there is a car that is coming you are interested in, you are welcome to become an evangelist for that. Or the Sondors car. Or Electric Airplanes.
Third, yes there is a lot of talk on Tesla and there some Tesla die hard's on the forum, but the fact of the matter is Tesla is the dominant EV model today. (Again, I sometimes find the unswerving loyalty among some to Tesla as strange and even irritating at times, but all sorts make up the world.) There is a lot to talk about Tesla as a simple fact.
Fourth, many of the models that you allude to are away in the distance or have come and faded out. There was a lot of talk about Jaguar I-Pace and the Audi-etron earlier. No one talks about them now as they are not popular. There was a lot of discussion on the Porsche Taycan, and we may see more discussion if it lives up to the hype. Else it will be consigned to the corner. If there is something to talk about, people will, especially if it is a great car. So as the models come closer, talk will increase.
Finally, I post a lot of articles of information to general EV audience. I have put comparisons, I have drawn attention to new developments as have others. Only a few of my posts are specific to Tesla. Like yesterday, I found that Fedex was buying Chinese EV trucks.
@Domenick had recent discussion on battery technology.
@bwilson4web has posted on charging in several forums. Similarly, there has been a lot of discussion on charging and charging stations in various forums.
If you believe that the forum does not have enough articles on other cars, you can help drive the discussion. Respond to posts. Add information as you find it. Ask for information on specific areas if you are interested and someone will help you with it. In other words, you will get what you put in to it.
I think it was Gandhi who said "Be the change you want to see..."
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And if one post articles of interest, I usually read them and respond to them. So do others. And I will if you post also.