Curved glass still won’t be accurate it’s just better because most viewers don’t actually understand how the light should bend on a curved surface so when it’s all distorted they’ll likely accept it.
The only way to get accurate refraction is to use ray-traced translucency. But that will come with other quality hits elsewhere, in addition to the performance hit.. so it’s not a clear cut win.
Another option is to use cube maps. This is how the famously good looking Half Life Alyx bottle and liquid shaders handled refraction, so it can be very convincing for bottles and glasses. Here’s an old example I made ages ago: