Would you mind giving more specific examples?
sure, here's a bunch of random mods that I have:
Roider Union: neutral faction, lots of strong ships and weapons, no threats
XhanEmpire: neutral faction, lots of very good weapons, some strong ships, no threats
Shadowyards: one of very few mods that adds benefits to both players and pirates. However, pirates receive sub-par versions of ship hulls.
ScalarTech: friendly faction, lots weapons with power level above vanilla, no threats
High Tech Expansion: some mercenaries get the mod ships, but player benefits from them more because of how easy they are to get
Tahlan Shipworks: one of those very few mods that does provides additional challenges (domain era capitals, plague bearers). However, all of them are optional so it's possible to just play the game by using lots of really strong tech it also adds.
SEEKER: similar to Tahlan in this regard
Kadur: very strong neutral faction, no challenges
Diable Avionics: extremely strong faction that's mostly neutral to the player, no challenges
Note that mods like Tahlan and SEEKER at least give the player really strong tech only for exploration. In most other mods you can just go to the modded faction's station and buy anything you want.