If you grow up in a traditional Buddhist community, there's more of a clearly defined set method for being Buddhist, and how to integrate Buddhism into one's life.
If you grow up in a non-Buddhist community, you have to find your own way to a greater degree and its unsurprising that people who have no standardised roadmap within their local community, will come up with diverse ways of applying Buddhism in their own lives. That's neither inherently good nor bad... it simply means there's not much in the way of convention to defer to.
We see these differences even in our interactions on Buddhist forums.
Western Theravada is certainly not homogenous, but neither should it be portrayed as two diametrically opposed approaches.
“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)