I would say it can be harder at times, but not because a person with arthrogryposis is less lovable or less worthy of real love. The hardest part is often the emotional side of it. It can bring up fear of rejection, fear of being misunderstood, fear of being seen as a burden, and fear that someone will only notice the disability before they notice the person. That can make opening up feel scary. But no, I do not believe arthrogryposis means someone cannot find a partner or keep a strong relationship. A real relationship is built on connection, honesty, trust, humor, patience, attraction, and how two people treat each other, not on whether one body moves like another.
I think maintaining a relationship can come with extra challenges sometimes, especially around independence, physical limits, fatigue, pain, accessibility, or intimacy, but every relationship has its own challenges. The important thing is whether both people are willing to communicate, adjust, and care about each other in a real way. The wrong person may make someone feel like they are too much or not enough. The right person will make them feel safe, desired, respected, and fully seen.
The advice I would give is this: do not go looking for love as if you need to apologize for yourself first. Do not shrink who you are just to be accepted. Let someone get to know your full self, your mind, your humor, your heart, your values, your way of loving, not just your diagnosis. Be honest about your needs, but do not confuse needing support with being a burden. And if you are already in a relationship, talk openly about the hard stuff instead of carrying it alone. The strongest relationships are not the ones with no struggles. They are the ones where both people keep choosing each other honestly through them.