How many hours have you put in (I suspect many..) ? Did you not expect this to happen?
What I've played isn't "end game content" what I've been playing against is RNG.
Once you have the weapons and increase your power, there should be content to tackle with it, there isn't.
Worrying about what gear XuR drops and ploughing hours in to earn coins and get drops is actually pointless.
I know this, BECAUSE of the hours I've put in, I've not kidded myself that I am actually doing anything other than trying to collect certain guns (half of which I don't even bother dumping XP in to) just for the sake of having them, because I won't bother levelling or using them anyway as there is no need to, it doesn't matter what you equip.
Currently I have:
Hawkmoon
TLW
Truth (I've passed on the upgrade every single week)
Mida
Thunderlord
SGA
p&T
Crest of alpha lupi
Claws of amkhara
Light beyond nemesis.
Knuckle head radar
Heart of the praxis Fire
Star fire protocol
Helm of dire amkhara
Over soul edict
Fang of if Yut
Word of crota
Sword breaker
All of that is gear I simply have not bothered upgrading as there is no need, it has no relevance to the content currently on offer.
Time attack? Score attack? Kill attack? Survival? Endless defence? Etc.
Playing PvP? To what end? No ranking, no leader boards, no gear unlocks, no levelling. It all resets and starts again and th only thing that it effects is your K/D ratio in the app.
I am not ranting or complaining, I am just telling you how it is, there is NOT a lot to do in the game other than collect the gear (most of which you will not touch).
If you can accept that all you will doing for hours and hours at a time is trying to get the drop you want to complete your collection then yes you can plough hours into it and how much time you put in is entirely dependant on RNG.
If it favours you, you can literally have no reason to play after 2 weeks.
If it doesn't (like me) you can get months out of it if you can keep playing the same thing over and over just for the sake of collecting.