Assumption. Screens are wider and wider, bigger and bigger.
Solution 1: Make more one-page layout sites like there is no space on sides.
Solution 2 support solution 1: Make everything 2-3 times bigger so there can't be space on sides.
Solution 3 support solution 2: If there is some free space, call it neccessary white space.

It's a trend i see around me. Sometimes i don't get it. More than 1 year i have no side menu in designes what i coded.