Why right now is different from five years from now

Elevated blood sugar affects blood vessels gradually. Early on, the changes are mild and your body responds well to support. Later, after years of it, that same vessel is far harder to work with.

The same applies to your testosterone. Insulin resistance is associated with lower testosterone, and the two feed each other, lower testosterone makes insulin resistance worse, which lowers testosterone further.

Which is the actual reason this matters now. You're at the point where supporting both is straightforward. Most men don't do anything until it isn't.