I can't speak for others but I got a tiny baby Dwarf SunGlow boa a short while back and he's doing great - straight in his viv / vivarium .
Some people swear by rubs especially for Royals / Ball pythons but the mainly in the uk it's just the breeders who need the space to keep loads of Royals in - who use Rubs .
I've never used them for any of mine ...