Because MSFT long, long ago abandoned the concept of giving users choice, or just in general not treating them like idiot babies.
Brings me back to when I was contracting with them, same time Win 8 came out.
MSFT does what they call ‘dogfooding’, ie, every worker is alpha/beta testing basically all MSFT software all the time.
My team was managing SQL servers and running queries. SQL Manager, and a whole bunch of other shit completely broke when 8 came out.
It initially did not even have the ability to go back to a Win7 style interface.
They truly believed that limiting all office workers to a UI where they could have, at max, one pane on 1/3 of the screen and another pane on 2/3rds would be completely fine.
We effectively could do no work for about 1/3 of our contract.
Working at or for MSFT is a curse I would only wish upon my worst enemies.
I actually had to quit another, earlier contract as my manager expected me to work overtime without pay. Before that, my one cool boss just showed me that I was being paid about 1/3 of what MSFT was paying the contracting firm for me.
And that is to say nothing of the massive racism that all the American employees just looked the other way on: Pretty common for Indian employees of a higher caste to treat Indian contractors of a lower caste like total dogshit, and the line from HR was ‘its their culture!’.