Vent about cat food

I’ve been feeding my cat (now almost 2 years old) boutique, organic food from bougie brands since this little dude could eat and his litter has always been a nightmare. At first I figured it was the typical parasite thing kittens have to deal with (he’s clean now), but a couple months ago I switched to Purina One (I swear they’re not sponsoring this). I have the purina one dry food and the cans. Feed him twice a day, alternating between type of food. Ever since I switched, his litter and bum have been immaculate. No residue, no mess on my floor.

I must’ve shuffled through so many brands and this is the only one that doesn’t make my cat have runny litter. Is there are catch or something? Or is Purina One legit