"It's a red flag that draws attention"
For the runs that I want my heavy-duty armor on, the armor is not going to be the thing that gets the HTRs called. The book seems to imply that runners wearing heavy armor is an escalation of force that will be met in kind, while ignoring that the converse is equally true - if I know that the target and/or other parties are going to be bringing heavy firepower, I need to be prepared.