Theravada For The Modern World is another one you could have used.
As for the suggestion, we're always reticent to create new forums unless they are structurally required to facilitate a variety of discussion that could not be done elsewhere.
The fact that in this instance there were multiple sub-forums which could have suitably hosted your topic, suggests to me there is no problem.
I feel that Dhamma Wheel covers the Buddha and the Dhamma parts of the triple gem pretty well but could see some improvement in the Sangha part.
We're certainly not averse to that... but it would be a matter of thinking hard about what the forum would be focused on, and why such conversation cannot be profitably be held in other areas of the forum.
“I hope, Anuruddha, that you are all living in concord, with mutual appreciation, without disputing, blending like milk and water, viewing each other with kindly eyes.” (MN 31)
What is the final conviction that comes when radical attention is razor-edge sharp? That the object of the mind is mind-made (manomaya). (Ven. Ñāṇananda)
"If you have always believed that everyone should play by the same rules and be judged by the same standards, that would have gotten you labeled a radical 50 years ago, a liberal 25 years ago and a racist today." (Thomas Sowell)