In all seriousness, shoot it for a while before you decide to change something. Because X said Y needed to be replaced, that doesn't mean it needs to be replaced for you nor does it even validate that X had a clue what they were talking about.
Go shoot it....find out how YOUR pistol works for YOU....then determine what, if anything, needs improvement.
I understand ammo is expensive. But....if you go spending your $$ on "upgrades" that may or may not be needed, you sure as heck won't have any $$ to buy ammo. The best thing you can do with a new firearm is to learn how to shoot it....after all, bullet placement is key to an effective defense.