We come to understand the groundwork of Buddhism, along with traditional beliefs/traditions based on what the mind may declare, what tradition may teach, what the sutra may declare. Beyond the Tripitaka, is not much of what we rely on for Buddhism outside the scope of true enlightenment? In short, in today's world doesn't secular Buddhism better fit reality?
You know, speaking personally, I've never been able to make hats work. I've tried on a lot of different hats, but no matter what, when I put on a hat I end up looking like the world's biggest doof. Some people really rock hats; hats suit them. I have to respect that, but honestly it doesn't help answer the question of whether or not we should all wear hats. It's a contentious point.
We could argue about that, I suppose, but while we do the meal is getting cold.
We all need to develop discrimination: to know what is important, and what is not, and to avoid getting tangled up in the latter. No one can discriminate for us. Spiritual traditions can help keep us on the path or hinder our development; secular independence can free us to advance or get us lost in the woods. Wear a hat, don't wear a hat; in the end it's irrelevant, because a hat has nothing to do with awakening. Either way, it's just a style we adopt for the sake of our egos while we walk the path, and sooner or later we're going to want to slough off matters of style.
I would like to have a clear definition of 'secular Buddhism' as understood by the OP. I can make little sense of the phrase.
From the Wiki definition I can see no difference between 'secular' Buddhism and Mahayana. It seems to be a phrase used by those who believe Buddhism is about religious beliefs and the supernatural. As this is a wrong view the phrase seems redundant and meaningless.
I would normally assume that someone who calls themselves a secular Buddhist has almost no understanding of it.
As for Buddhism not being fit for today's world the idea is ridiculous. It's the same world it always was. I really cannot imagine how a modern human with internet access can confuse Buddhism with religious beliefs and dogma and oppose this to secularism. It tells us something about how little effort many people put into understanding philosophy and religion before leaping to conclusions.
The discrepancy between Buddhism and modern society is not the fault of Buddhism. This problem signifies that society is drawing away from reality. Of course, since "Buddhism" is the expression of the Dharma in samsara, it is also subject to degeneration.
Pristine Dharma as the Buddha knew it will remain the absolute Truth. The ease of access to it will fluctuate and become more difficult as society falters against it. Based on my understanding, "secular Buddhism" is an example of corruption.