I’ve been rewatching the 90s anime. My biggest complaint is the way that the outer senshi (Sailor Uranus and Neptune) act throughout the whole season. They act superior to the inner senshi, claiming that Sailor Moon and the others are incapable of doing anything. Obviously they weren’t around the previous two seasons, otherwise they’d know just what Sailor Moon and the others were capable of, but where do they get off on behaving this way? If they are so superior to the inner senshi, then why weren’t they around to save the world in the first two seasons? I wish Sailor Uranus and Neptune would stop being stubborn and denying that they are all Sailor guardians and need to be working together as a team.
You are not the only one with that complaint. For the longest time, I utterly hated both of them simply because of their attitude and how it hampered the heroes and helped the enemy. It was bad enough when they walked away from Nekoneru. It was worse when after Sailor Moon got the Holy Grail and powered up, instead of those two and Pluto saying they'd work with our gang just to keep it from falling into the wrong hands, they decide, "No, we have to find who this treasure really should belong to and are going to leave you girls to rot with your own battles."
That said, over the years, I've learned to understand their point of view no matter how much I personally disagree with it. As you mention, they were not around the previous two seasons, largely because they were fighting their own battles against the proto-Daimons at the same time. In other words, much like the general public, they were unaware of the
extent of the Sailor Team's exploits. If they don't know, then of course they're going to see these girls who are claiming to be Sailor Guardians but can't even battle mere
minions and look down on them. Coupled with their protests about letting the enemy attack people and steal their heat crystals, they deemed these girls as both immature and incompatible with their goals. They have a job to do and don't have time to babysit junior heroes who are a hindrance.
There's also the issue that deep down, both of them keep an antagonistic attitude because both of them know they'll have to do some rotten things and make some hard choices and they don't want the other girls to have share in that. Since they're older, they have a responsibility to take on the burden and when it's all said and done, there might not be a place for them at the table, so to speak. For that reason, they don't want anyone to miss them when they're gone. If the others hate them, then it won't make anyone sad if they lost their lives or worse.