> is there any hard evidence that huawei is a legitimate security concern?

As someone with a lot of huawei in their infrastructure, this is what I really want to know as well.

The US government has lost a lot of credibility over the last few decades with its lopsided foreign policies that completely tip towards self-serving and agenda-pushing rather than decency and public good. There is nothing indicating that this particular issue is any different.

Unless the US government shows hard evidence that the company is harming us, we're not ditching them.

Innocent until proven guilty applies to entities you don't like too.