I don´t think Xtar is bad in general, but I never understand wth they thinking if they make a new charger in 2024 with basic things missing like individual slot configuration or brandnew chargers with one charging current for NiMH 
Vapcell also make basic chargers but they listen to their customers and let me control the charging more than Xtar.
One of the most universal charger is the Enova Gyrfalcon S4000/S8000 Pro, but I think you have already see it here and maybe it´s not your price range. Still waiting to buy it in my country