I've had my ZZ plant (Zamioculcas zamiifolia) for about eight months now, and I'm still amazed at how tough it is

I've had my ZZ plant (Zamioculcas zamiifolia) for about eight months now, and I'm still amazed at how tough it is. I've definitely neglected the watering schedule more than once, and it just keeps thriving. My only real question is whether I should repot it soon—it's not showing signs of being root-bound yet, but I'm wondering if waiting too long might stunt growth. Has anyone else had success repotting theirs, or is it better to leave it alone if it's doing fine?