Debatable.

The first major VMware version which does not support the installable desktop client has a plenty good enough HTML5 version of the web client. So either/or, you should be good to control your hypervisors without Flash.

And at worst, you shouldn't need to use a Flash-based UI to upgrade VCSA or your hypervisors.

> The first major VMware version which does not support the installable desktop client has a plenty good enough HTML5 version of the web client

That's false. The old thick client stopped working with 6.0, which got a very poor, limited and extremely buggy HTML5 client in one of its latest updates. 6.5, latest update, has a somewhat usable but still limited ( missing features) HTML5 UI ( funnily enough some new features were only in the HTML5 UI, while some others were only in the Flash version). The first version that had a fully usable for everything HTML5 UI is 6.7 Update 3, which came out a few months ago.

On the bright side, unless VMware's interoperability database is mistaken, vCenter 6.7 U3 can manage hosts back to ESXi 6.0, so this is at least "retrospectively true" unless you're stuck on an earlier vCenter version.

I mean, perhaps you use features I just haven't had to, but I don't recall any time in the 6.0-6.5 era needing something the HTML5 client couldn't do servicably.

I've seen it mostly in advanced VM management like weird drive configurations.

iirc, OVA deployment was unavailable, then buggy.