theres a dearth of available and reasonably inexpensive vet Ends out there, id ie willing to take a punt and hope better coaching and environment can turn him around. he was a top 10 pick so there has to be a high talent level innate there.
you're not going to take a punt on a player that's not showing traits that suggest they could breakout at any point - especially one with this much money involved and this bad a fit - he's a DE with very little evidence of an ability to play OLB in a 3-4 or set the edge and doesnt create consistent edge pressure despite his athletic gifts
he's a guy who's weaknesses when he was coming out have kind of borne with him...
in bullet point form:
- relies to heavily on pure athleticism to create sacks
- not bulky enough to be a threat in power-based rushes (bulls or speed-to-power)
- doesn't transition between moves fluidly (if ever)
- small arms can lead to getting locked in by OL - can lead to stalled rushes
- seems content to stay blocked if initial move doesnt bring success
- doesnt shed blocks in the running game
- lack of overall viciousness
also important to note with regards to being a top 10 pick: that 2015 draft was notoriously and historically poor overall as a class - other top 10 picks from that year include: Jameis Winston, Marcus Mariota, Dante Fowler, Kevin White, Vic Beasley, Ereck Flowers
of the top 10 picks the only clear hits i'd say were Brandon Scherff, Leonard Williams, Amari Cooper (who is hit and miss) and Todd Gurley (who's not the same post-injury)
but if you extend to the whole first round in that class the picture doesnt get better... Trae Waynes, Danny Shelton, DeVante Parker, Arik Armstead (who's been better this year but poor through his first 3 years), Cameron Erving, Cedric Ogbuehi, Shane Ray, Breshad Perriman, Laken Tomlinson, Phillip Dorsett, Darmarius Randall, Stephone Anthony
there are other players who were fine in the first round that year but the only actual proper hits from that first round that ive missed out were Byron Jones, Marcus Peters (who's now on his 3rd team now he's here with us), Andrus Peat
otherwise its the bud duprees and the nelson aghalors of the world
TL;DR: Vic Beasley was a top 10 pick because of the weakness of the class he was in not because he was an exceptional talent