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When making any sort of pragmatic argument, the ideological refuse to accept its merit and usually try to change the focus.
It is very frustrating.
He made the mistake of commenting on an unrelated manner which allowed you to claim he was changing the subject while you ignored the first part where he was on topic.
The unanswered question remains, why would anyone choose Tizen over the other Linux distros?
The only reasons I can think of:
You want to stay close to Samsung's product line.
You think it will be more popular in the mobile sector than the others focusing there ( jolla, firefox, ubuntu).
All you needed to do was to pick one of those and this conversation would have been a lot more productive of a discussion.