Most high end companies don’t use stainless many charge extra for powder coating the water pan.
I do agree, in a perfect world, the water pan would be stainless.
The above said, you should be running some type of anti rust additive in the water. Another option would be to make a custom 1 piece stainless water pan.
I recently looked at a Squickmon’s Engineering E-light table (4x8) it comes with a non-painted/coated 3 piece water table (powder coating +$800)
No computer, pedestal was +$800, 1 year warranty (+$800 for 5 year warranty) unit is fully assembled, estimated shipping from AZ-SC $2,300
Base price about $9,500
Yes there are other differences in components and the structure of the build.
I guess what I am getting at is the XR is an amazing machine given its price point.