But it is untrue that these devices are particularly secure, especially compared to the average linux distribution. This is Microsoft marketing and nothing else. On the contrary, the case for security is not to use MS systems because one of the largest threats for industry is industrial espionage and a lot of Microsoft components and data retention cannot be audited.

Boot sector attacks have become quite rare and a sensible threat analysis is the basis of good security. Otherwise you could sell any crap as security. Unplugging your keyboard stops a lot of attacks actually...