I wouldn't recommend one for deadlifts.
For squats and a few other movements (mainly pressing), I like a weightlifting shoe. Now, I squatted in Chucks for years with no issues, but the elevated heel and super grippy soles are nice to have when squatting. Feels like depth is easier to hit.
Definitely not a "must have", but there are worse things you could spend your money on in terms of getting bigger and stronger.