"creates a heightened theft-by-hijack risk"
So the risk is increased from 0% to something maybe approaching 0.0000001% if we're being generous. Having your doors locked while driving somewhere like Johannesburg might be an important safety feature, but in the UK? When's the last time anyone actually got pulled out of a moving car and hijacked? Note that the report specifically says this new flaw has nothing to do with the the issues making it easy to steal cars with keyless entry, it's a separate problem that doesn't actually appear to be a problem at all.