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So long as you use a dead-flat, stable, pre-primed canvas off the roll that neither buckles nor presents other surface problems when taped to a back-board, I can only see advantages . . . it's quick, it's easy, and gives you a lot of flexibility to choose the sizes of your projects and perhaps crop them later.
The downside is that stretching the piece over bars is more difficult once finished, and may stress the applied paint. Bending edges over the bars may upset some paint, and the work piece would have to be a minimum of 3-6" "oversize" in each direction initially when taped to the board.
Better to mount such finished pieces to panels - for example, Gatorboard, alumalite or dibond . . .
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