Why title-tag not added in functions.php ?

[developerzinan]

I like this starter theme very much but I think there are some issues that developer should update immediately .

1. add_theme_support( 'title-tag' ) still not added in functions.php . Still _tk theme follow the old strategy, means in header.php title tag function .
2. A standard theme should have a fullpage template but unfortunately _tk theme hasn't this expected structure . As I saw a topic related full page structure at Question: How to create full width page? #16 but there was no proper solution .
3. Screenshot size should be 1200x900, as preferred by WordPress new rule .
4. Comment form input fields under comment box, it should be style in bootstrap . Check the screenshot.