Why is the Roborock Q5's 3.8-inch height a big deal?

Regarding the Roborock: At 3.8 inches tall, the Q5 slides under couches, beds, and dressers that have been collecting dust since the last administration. Low clearance is one of those specs you don’t appreciate until your robot gets stuck halfway under the sofa and starts beeping for help. The Q5 doesn’t have that problem — it goes where other vacuums fear to tread.