Is the Mail.app look being copied too much?

Fraser Speirs, developer of apps like FlickrExport and Xjournal, posed an interesting issue on his blog the other day: is the general look and UI of Mail.app being duplicated by too many other developers? Fraser doesn't necessarily dislike the Mail.app look and feel, nor is he taking a jab at developers, but since he's running Mail.app, NetNewsWire and Yojimbo, he's making a few errors in Exposé simply because these three app windows (not to mention others like Ecto) look very similar.

Fraser poses a valid point, and it's a good question I thought worthy of mentioning for you TUAW readers. What do you think? Are too many apps using the same (handy) UI and cluttering up your desktop and Exposé views? Sound off.

[via Hawk Wings]