Very few people actually work with simply writing stuff in Word or using Excel, most office jobs actually require some other tools like accounting and media creation. Further, you can not even watch higer resolution than 720p Netflix on Chrome
There are a number of business apps coughQuickBookscough where there is not a whole lot of choice about the OS, if one is using the Desktop version of said app...
please stop spreading the myth that ChromeOS is somehow immune to malware. nothing stops a dev from uploading malware to the Chrome web store, and there are many such cases that happened. the only meaningful metric of how safe a piece of software is, is the size and investment in the team responsible for the security of the product. And MS is leading in this aspect.