"Suitable" is in the eye of the user. In our case, "suitable" is defined by our customers, who contractually mandate the applications we are to use when creating files, documents, and other content we deliver to them. Per contract, substitutes applications are unacceptable.

The ONLY reason to use an OS is if it supports the applications you want to run. If the apps you use are available for multiple OS, then factors such as cost, attitude toward vendor behavior, etc. can come into play. If the apps you want or must use are available for only a single OS, then that is the only option.

If you had titled your original post "Why I use Ubuntu on my desktop", I would have agreed with you completely.