Many of us do both – include review requests in the final email AND also use the new automated Amazon’s “Review Request” feature.
But if you are nervous about this, you can just focus on the automated feature only.
Kirsty, I, and I believe, Issac still all use both email/request button. The ‘request a review’ feature is still quite new, but there could be a time when Amazon reinforces this more strongly. The option is yours.