Last year I had a bottle of whisky from India which I’m pretty sure also dropped the e. That too was a lovely drink and could easily have been mistaken for scotch.
https://scotchwhisky.com/magazine/features/19680/not-all-jap...
I hate to link to Bloomberg but this article is pretty good:
https://www.bloomberg.com/news/articles/2019-09-19/that-expe...
While there are patterns with which countries use whisky vs. whiskey, there's no legal requirement.
However it is not silliness to detail regional variations in spelling, particularly when, as in this case, they give clues to lines of heritage.
Wales's primary Whisky distillery [0] calls it whisky.
Highland. Lowland. Island.
Varieties from the same region share characteristics, but they're distinct from each other.
I'm curious how historically the kilns would be fired across Scotland, if peat was more prevalent?
http://www.bairds-malt.co.uk/Bairds-Malt/Process/process mentions about using hot air.
https://www.laphroaig.com/en/whisky/our-process - Has some nice videos, including them using solely peat to kiln the malt.
As well as the fact that irish whiskey generally has a mashbill containing a portion of unmalted barley. Not sure, but I think it is at _least_ 30% as per the Irish Whiskey Association rules?
Single malt Scotch requires (as per SWA rules) a 100% malted barley mashbill.
Blended Scotch, on the other hand, has no such requirement, and is typically a blend of Single malt Scotch and alcohols from other cereals.