Well up until just a few years ago BK was in near constant fights with its franchise owners. That and changing ownership a few times isn't going to give you a good base to operate from.
That and McDonald's just owns kids.
I still prefer a BK burger to most MCD's burgers.
There is a BK near the office, and I used to attempt a drive-thru on my lunch -- but, their drive-thru was actually slower than going inside. After a few attempts (and being late back to the office once) I gave up.
To contrast, there are a group of McDonald's stores near my office that are testing a linked drive-thru timing application. There's a scoreboard visible from inside the work area that ranks all the local stores in terms of drive-thru speed and service time. They've gamified the system.
Well, the article kind of summed up BK's history in one line:
"He’s Burger King’s 21st CEO since the company was founded in 1954"
That's literally a new CEO every 36 months since the company was started sixty years ago. That's just boggling.
BK has lagged way behind McDs and Subway on various fronts. Lack of new product items, old technology, minimal promotion, dirty and outdated dining rooms. The last BK near me that hasn't closed down looks like it hasn't had a coat of paint in 15 years. Meanwhile McDs is tearing down and rebuilding new stores ground-up all over town.
Twenty or thirty years ago, in America, McDonald's and BK were literally in a deadlocked battle of the giants. Burger wars! Those days are long gone.