From the specs/manual it appears the reason you would want to choose a SmartSolar controller with VE.Can instead of one without is if you want multiple charge controllers to all be in perfect sync with each other as far as charging stages. Is this correct?
If so it would be really helpful if the top of the page at https://www.victronenergy.com/solar-charge-controllers would mention that to make it easier for people to understand why you should choose one with that option or not. Everything else is explained at the top except for that.