Sites rarely break during an update. They break three updates later, when a plugin that stopped being maintained meets a PHP version nobody chose to change. By then nobody remembers who touched what, so nobody touches anything.
What follows is not a crash. It is a slow loss: a contact form that stops sending and nobody notices for six weeks, a checkout step that fails in one browser, a security patch that sat unapplied for four months.
Maintenance is not “applying updates”. Maintenance is somebody checking afterwards that the site still does what it should.