Muscle memory for folks who have been doing it since before -i was an option. I still instinctively type `sudo su -` because it worked consistently on older deployments. When you have to operate a fleet of varying ages and distributions, you tend to quickly learn [if only out of frustration] what works everywhere vs only on the newer stuff.
`sudo su - <user>` also seems easier for me to type than `sudo -i -u <user>`
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