20% has been the norm for the past 15 years or so.

I built a webapp for work, and when a new PR firm / subcontractor entered the picture, they complained that it didn’t work. I spent hours pulling my hair out until I figured out that they were using a seven year old version of Safari. Apparently, their laptops stopped receiving system updates from apple, and you can’t upgrade safari alone. As someone who has never used an Apple computer, this blew my mind.

I have never had a single landlord where this isn’t the case, except in instances where they are too cheap to even hire professionals to do things that they don’t have the skill to do, and they get their dipshit son to “fix” the sink that fell clean out of the kitchen counter with a lumpy bead of clear silicone and a 1’ piece of 2x4 wedged underneath.