I've noticed other subtle changes switching between Mouse and Touch mode, e.g. I was wondering what happened to the bin icon that used to pop up next to the email in Outlook, Switching to Mouse mode, it re-appeared.
I can see the rationale for such a feature, but when the default mode is silently changed, you spend ages trying to find out what has 'gone wrong' or is it a version issue, etc. It's yet another of those 'Microsoft knows better than its customers' things!
Every time they try to be helpful by deciding for you, they seem to get it wrong. They've made strange implementation choices (used to be no option to disable wrapping within a word in PPT unless you have the Asian language pack installed), and as demonstrated
by the 'Excel (on Windows) Smooth Scrolling' debacle, ignore a mass cry for a major usability feature for years.