The biggest practical shift here is that disabled people with bus passes can now travel during peak hours in London without being turned away or having to pay, whereas before they were locked out of morning and evening commutes. This sounds like a small admin thing but it massively changes what people can actually do - you couldn't get to work or hospital appointments if they fell during rush hour, which is kind of the opposite of helpful.
Before the change, the off-peak restriction meant disabled passengers could theoretically travel free, but only between roughly 9:30 AM and 3:30 PM on weekdays, plus evenings and weekends. That's fine if your life fits neatly into those windows, but most jobs, medical appointments, and real-world scheduling don't work that way. So yeah, technically free but practically useless for anyone with a normal schedule. The removal of that cap means the pass now works like it's supposed to - actually free travel whenever you need it.
One thing worth checking if you're helping someone navigate this: the pass itself doesn't change, and there's no need to swap it out. If someone's got an older disabled bus pass that was issued before the rule change, it'll work the same way going forward with the updated rules - no application needed. Just worth knowing so folks aren't sitting around waiting for a new card that won't arrive.