Well, I'm just assuming the game uses the standard RPGM battle system, which might not be the case. Most of the custom battle systems function differently (and better) than the original (such as the FFX and Ar'Tonelico ones), aside from there being on-screen character sprites. But I guess it could just use the front view part, while having other things customized I guess, in which case the front view itself would be the only issue.
Anyhow... while it's only a matter of seeing or not seeing the sprites of your own characters, I personally think seeing your own characters in battle adds a whole lot. It's a simple visual detail, but to me it can mean the difference between battles being enjoyable or boring.