I always thought that the easiest victory conditions are economic and scientific. But since there are 3(?) military VCs, you have a point as well. Wonder and diplomatic VC sometimes just don't work out. Quest victories need some wars as well iirc, but I haven't done them with all factions. For me, as a peaceful civ player, it didn't feel more like a war game as civ VI - in contrast to AoW, TW or EU. Perception differs.
I look less at victory types and more at how the game's different systems work together.
Civ puts a lot more emphasis on infrastructure. There are four big infrastructure systems in the game.
Science and technology.
Production, buildings, and wonders.
Culture and social policies.
Religion and beliefs.
And all of these systems feed into other. You can use science to unlock mines and other sources of production. You can use your production to make buildings and wonders that will increase your culture. You can use social policies to generate more faith and increase the strength of your religion. You can choose religious beliefs that increase your science and help you research technologies faster.
Infrastructure in
Endless Legend is much less complicated. It's mostly just science and production. Influence can be used to help with infrastructure via the empire plan mechanic, but its main purpose is to start and end wars.
War in
Endless Legend, on the other hand, is much
more complicated. That game has a whole bunch of war related systems that
Civ doesn't have. Hero units with their own upgrade trees. Customizable equipment for units. Minor factions that each have their own unique unit. You can tell that the developers put a lot of work into making this part of the game as deep as possible, but the downside is that the rest of the game feels shallow, especially compared to
Civ.
As another example of what I'm talking about, compare
Civ 6's city states to
Endless Legend's minor factions. Only about one-sixth of the city states give military related bonuses, with the rest all giving infrastructure bonuses. Less than half of the minor factions give infrastructure bonuses, though. The rest all give combat buffs to your military units.
Another useful point of comparison is
Civ 6's research boosts and city state requests versus
Endless Legend's quests. Granted, there are a few research boosts along the lines of "kill an enemy with this specific type of unit", but the vast majority of research boosts and city state requests are things like "build this" or "recruit this type of great person" or "find this somewhere on the map".
Endless Legend has a lot more quests that just amount to "go to this place and kill the big thing that's there".