Cedar is softer but not weak or something to be worried about .... yes it's softer than sitka spruce but it is still very durable and hardy.
Two Avalon playing artists, Nick Harper and the late Eric Roche play/played with a very strong, fantasticly abusive playing style and they chose cedar tops over spruce and their guitars have always had to endure a hellu'va beating .... I'm happy to report that we've never had any complaints on our cedar being too "soft"
Side note - We only get our cedar from one supplier in Alaska and he always supplies super stiff cedar.
Hope this helps