Seems fine to me (Assuming you mean the vba site).

Yay it's back.
The last ~8 hours it was off.

Maybe someone can explain why anyone would still be using this product. It hasn't been updated or supported in almost two years. It functions on software versions that have long since been deprecated. vBulletin 3.6.0? PHP 4.0.6? MySQL 3.23?

What happens to all of the sites using it when it's no longer compatible?

Unless I missed something, it functions on 3.8 & 4.2.

I'm sure it does, as do many mods but what happens when it doesn't?

Then you make it ;p

The reason I bring this up is because it seems there's a growing train of vB4.x mods which were once hugely popular but are now entirely unsupported. Some of those have caused major issues with sites (cough, vBSEO, cough) when they ceased to function.

Ironically, vB5 does the same things vBAdvanced does and more but even that wouldn't be a simple upgrade. I've stepped away from modifications entirely. I'm more curious as to why so many sites haven't.

Functionality, of course. Imagine if wordpress owners steered clear of plugins, the internet literally wouldn't be the same lol. Get yourself a developer either in-house, on retainer or available for freelancing when need be (depending on your budget) and don't hold back on functionality!

Here's my take on "functionality" based upon my own personal experience:

If members never know a feature or function exists then they make do without it.

If members are given a feature or function and then it's taken away they whine like six year old girls who have been told they cannot have any pudding if they don't eat their meat.

I realize different solutions work for everyone but mine is to code HTML5 / CSS3 pages by hand so they are up to current standards and not reliant on any third party maintaining a modification or add-on. To me it seems like a lot less work than dealing with third party plugins that stop working, especially when many are no longer maintained and not marked reusable code. In many cases the developers are no longer active.

Your problem strictly relies on you not having a development background or someone on your team with one. If that weren't the case, you'd be able to have your cake and eat it too (or the pudding as you mentioned ;) )