[jbstack]

> would that then be a much better tool

Better than before, yes. Good for general legal work that doesn't require robust legal research, yes. Sufficient for full legal research, no.

The problem is that "a lot of case law" isn't enough case law. You need close to everything. Otherwise this can happen: Canlii case X -> Legal principle Y. Westlaw case Z not on Canlii -> X overriden, Y no longer good law. Or you might simply not find a case which cogently supports your argument, when one does in fact exist. Or, conversely, you are unaware of a detrimental case which your opponent knows about because they have Westlaw.