I’ve been out for quite awhile- I think since shortly after Deimos and the cambion drift got added but honestly I’m not sure exactly when I stopped playing.
Any new guns/frames I should be trying to grab in particular? Any massive shifts in how things are modded? New quests that are worth doing?
I was trying to unlock Steel Path, but I realized I need to do New War first. So now I’m currently trying to get all the various stuff I need to craft a Voidrig.
Only semi-major change imo is the pet rework, scanning else comes naturally in missions. Even then, the pet rework is just that sentinels respawn, and all pet types get some cool new mods.
Later in the story, you can unlock weapons that transform, incarnons, and they are currently the meta. How much you wanna gun for them is up to you, as you can do everything without them.