i swear its hard to satisfy peeps these days, if it ain't the rappers being overrated it's the producers, everyone has their own sound, and with most experienced producers they do switch up their sound while staying in their lane. You just got to listen.
My thing is whether a ni99a switch it up or don't, whether it be 9th or just blaze, stoupe or timbaland, if you truly like what is being made, why do you care? If it's hot to ya.....well it's HOT! It obviously has not bored you yet to keep listening (shrugs)