Primal was good? Did we experience the same game, the one with shit such as infinite remote super owl popamole stealth attacks? It had some minor incline such as some caves that actually required half a brain to navigate and conquer, but other than that it was Far Cry and all the shit that entails where they replaced weapon diversity and customisation with boring OP cooldown AI companions (such as the remote owl stealth kills of doom, or sabretooth tigers that is just automated rape).
I never heard of the survival patch though, maybe that made a big difference.
On survival mode, you can't upgrade the owl cooldown on attacks and any group of cavemen can kill a bear or sabertooth tiger especially if there are leader enemies, if they die, you can't respawn them too and need to tame another one, a big no no if your tame is a unique as you will lose it forever, sending them into a well defended camp is guaranteed you will lose them. You die ultra fast too as you can't upgrade your life as you could on the normal game and enemies do crazy damage, one of the few games that made nights feel threatening as the spawn rate of predators skyrocket at night, first Far Cry game where I encountered a rare sabertooth tiger at night and couldn't manage to find a way to kill the damn beast (couldn't tame it too as I needed to damage it to half health and I was failing at that) and gave up as it just got on its merry way murdering a whole enemy hunting group (the game cheats as it isn't as powerful when it is you commanding it).
The behaviors of the animals is pretty impressive too, your hunter vision doesn't highlight predators at distance and the big cats love ambushing you, if you hear a roar at night, get the fucking moving or you will be dead because it is probably very near you and your shitty bow will only kill it with head shots, good luck with that. Wolves love to divide and attack you from multiple angles, panthers are fast, hitting and running, hitting and running, wining by attrition, sabertooth tigers will RAEP you especially at night. The infinite health regeneration only cover you a single health slot and you depend on meat to heal fast but basic meat only heal a single health slot, only meat with rare plants you can heal more so if you wanna hunt the rare animals at night, prepare to run low on meat as you will ran out, only later this stops being a problem. You need to worry with energy too as if the energy bar gets to zero, you can't aim for shit, move slower and can't use the infinite healing.
The only way I found to end the endless cycle of RAEP is by having a bear friend as it is easier to replace them than tigers, they scare the wolves and those fucking annoying dogs and work as tanks against the bigger animals. It is true, outside of survival more, you can play care free and the lack of diversity on weapons hurt the game but on survival mode, it is fun, I don't recommend buying at full price as it is still a Ubisoft game and get fucking repetitive as always but I don't regret the few bucks and the 10 hours I wasted at it.