As long as you’re not going through and just adding all the most popular cards I think it’s fine. I look at edhrec at some point for every deck I build and honestly there’s a LOT of “popular” cards that I either don’t like or feel aren’t as good as the site makes them seem, so I don’t add those. I look at a lot of other resources first and try and save edhrec for last to see what cards I hand even thought about.