The thing about Xu-Fu is that his moves is telegraphed a mile away and just asking for a dodge or a force swap to make him waste his feed. Plenty of ways to counter it, unlike pre-nerf Direhorn, which just self-synergized too well
Xu-Fu is powerful, but only if you can time his moves right, a canny player can easilly disrupt the sequence. NPC tamers are predictable and Xu-Fu excels against them. Infact Xu-Fu does extremely well against Singing Sunflower, because of Sunlight empowering his feed and bringing him close to 50% life to dip under it easilly to gain a huge lifebuffer thanks to the empowered feed.
I see Xu-Fu as alike the Kun-Lai Runt
, which can be irritating if you dont know how to deal with it. Such as swapping out when you get the debuff to blunt his burst. A strong pet, but with plenty of counters.