Just what he looks like to me. Big bodied guy with crazy acceleration; Burks strikes me as a guy who would take a slant to the house instantly like AJ Brown.
Yeah, if you want a shifty YAC guy, Burks isn't going to be that immediately. While he might not possess the shifty-ness of some of his 2022 counterparts, he is still very good in terms of being a YAC guy due to his physique and competitive toughness. This is not a comp but I could see his career trajectory being similar to DK Metcalf in that he may not be asked to execute a full route tree as a rookie but can be used in a couple of really effective ways while he develops that aspect of his game. If you want someone like you're describing (shifty YAC guy who excels at creating separation), you'll want Williams, Olave, or Wilson IMO.
I like the AJ Brown comp. I've either read or heard/watched someone make an Andre Johnson comp somewhere and I can totally see that one as well.