This doesn't mean using jquery on them, just applying the same styles so the interface is consistent across all elements regardless of whether they are normal forms or scripted elements. Given that javascript is becoming a staple of web development, not just in general but on MediaWiki as well, there is little reason to maintain the strange discrepancy between the different button styles, as such inconsistency only serves to create more confusion for the users.
A button should be a button regardless of what built it.
For concerns about the styles themselves, see Bug 37744 and Bug 44855 - this bug is just about general interface consistency across elements.
Version: 1.21.x
Severity: normal