Triumph deliberately did not coat the alloy on the new 1200 series engines. They felt the need to include a warning about this in the Owners Manual. It explains that the cases will require cleaning with aluminium cleaner. Those of us who grew up with bare alloy cased bikes already know that well, but Triumph has a lot of younger customers who aren't familiar with metal cleaning and polishing.
I guess not everyone read the owners manual as some got very upset with corrosion that occurred when using the bikes on salted roads in winter, no daily cleaning. With bare alloy, daily cleaning is a must on salted damp roads and it needs to be thorough.
These disgruntled owners wanted ( and some received) warranty coverage on what was actually their own lack of maintenance!
Triumph did coat the alloy wheels with a clear coat and it seems to be standing up well. It doesn't look as nice as bare polished alloy somehow.
Glen