And a non-tech person will have great difficulty understanding that, or why? Why didn't you just write it correctly in the first place?
For the same reason Bluray replaced DVD replaced VHS. "The better solution didn't even exist at the time" (new browser features) often coupled with the equivalent of "Now everyone has a Bluray player so we can start using Bluray features going forward." (ubiquitous browser support)
That tends to get understood by my management. Compare it to something they are familiar with - and anyone over the age of 25 will be familiar with the BR/DVD/VHS comparisons.