From your own perspective. And hopefully, you don’t decide what is compliant to the rules and what is not.
I use 95 mods.
Most useful mods for me: CrosshairHUD, DefaultSprint, HUDTweaker, NumericUI, PanicStimm, PerilGauge, RevertRenamesUnlockedAndLoaded, TalentRefundBelow, WeaponFilter, weapon_fov
QOL Mods that bring a lot for me: MarkPreview, MergedTalentStats, MissionBrief, red_weapons_at_home, more_characters_and_loadouts, name_it, ShareTalents, show_accuracy, show_crit_chance, SimpleSpeedMeter, sorted_mission_grid, LoadoutNames
Mods that I really love: ManyMoreTry, Scoreboard (revisited with my own version)