If the client is expecting fancy visuals, I think it is obvious that lynx support is not needed. Whether the same goes for IE6 and other antiquities/exotics - that depends entirely on site's demographics. But that's off the point.
The point is that designing for optional rounded corners makes no sense IF the site design is considered an essential part of product marketing (and it obvious should be). Showing "degraded" version to IE users is not too dissimilar to selling unpainted cars in a poorer part of the town. People there are used to crappy experience after all, why bother.
The point is that designing for optional rounded corners makes no sense IF the site design is considered an essential part of product marketing (and it obvious should be). Showing "degraded" version to IE users is not too dissimilar to selling unpainted cars in a poorer part of the town. People there are used to crappy experience after all, why bother.