That more or less just brings the license up to date with the original intent. You used to typically have to distribute apps if you wanted end-users to run them. Now you can half-distribute the app by only distributing the client half to browsers, and claim that that doesn't constitute redistribution. The AGPL, on the other hand, defines that kind of half-distribution as distribution.
> you can half-distribute the app by only distributing the client half to browsers
Calling the client portion of the code of an SaaS application "the client half" is a stretch. 1% is a better estimate, and "1%-distribution" is a better word than "half-distribution". The client portion of code has its source distributed at the same time as when it runs on the browser.
> That just brings the license up to date with the original intent
The only clue to intent users of software have is the specific wording of the license. Changing the license cripples the software. How do we know the original intent wasn't to bait users in with an wrongly used license, then change it later on?