Why would i need bartender if I’m using Vuhduh? I’m not sure what extra functionality bartender is going to add here that vuhduh can’t do?
From your comments in the previous thread, I don’t think you actually do need Bartender. I think you mentioned wanting it for mouseover actions, but that’s not really its specialty.
I mean none of them is really “needed”, but they do add nice functionality to your UI… In terms of why would I want Bartender if I have Vuhdo, they simply do completely different things…
Vuhdo is a Raid Frames addon.
Bartender is an Action Bars addon.
There’s a small overlap in the sense that you can assign macros with Vuhdo to cast spells, but that’s about it. Both addons do a lot more than keybinding… Bartender allows me to configure, resize, move, hide/show actions bars, etc
Well I really hate the fact that it’s “hidden” my key bindings to where I can’t see the key over the ability now 
Hmm I feel there’s probably a setting for that but not 100% sure (can’t log in until later to confirm), my main bars are not visible most of the time anyway (faded away unless I mouseover them).
But regardless if you like it or not, I mean the addon allows you to configure pretty much everything with regards to how to set-up your bars which is very different to what Vuhdo does 
.
I use bartender to get rid of the standard artwork and rearrange things a bit. Aesthetically it just cleans things up a lot. I use vuhdo on my healers but not on other classes - I use an alternate ui for my character/party though to clean and simplify it up.
There is a way to turn on/off the key bindings option I believe, I just can’t check as I’m at work currently. It’s a weird setting check mark somewhere.