Certainly a company whose main focus is not finance would find that an additional burden for them to bear, so I believe the answer is absolutely yes, it would be more difficult for them to want to do cross-border finance if they have to do additional paperwork.
Most companies are quite adept at withholding personal income tax. You get your paycheque at the end of the two weeks or whatever, and a certain amount is deducted immediately for a whole slew of different taxes. They are not accustomed to doing that with their financial arrangements, and therefore it becomes a lot easier for them to simply get financing locally rather than going internationally.
However, on an international scale, like EDC, we would actually be able to give them very good financing terms and therefore promote more purchases from Canada.