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Re:Oat Milk Could Change the Way You Drink Coffee (2018) by Dimtree on Tuesday January 29, 2019 @09:07AM (#19026331)
I think you're missing the most common reason. Up to 65% of the global population is lactose intolerant to a degree.

https://ghr.nlm.nih.gov/condition/lactose-intolerance

Re:Oat Milk Could Change the Way You Drink Coffee (2018) by lawlorino on Tuesday January 29, 2019 @09:16AM (#19026408)
As a counterpoint that's not uniformly distributed globally, the incidence is much lower in Northern Europe including UK where OP is from.
Re:Oat Milk Could Change the Way You Drink Coffee (2018) by Dimtree on Tuesday January 29, 2019 @09:23AM (#19026461)
As a counter-counterpoint, you assume OP's ethnicity is Northern European just because he lives in the UK.
Re:Oat Milk Could Change the Way You Drink Coffee (2018) by n4r9 on Tuesday January 29, 2019 @09:20AM (#19026439)
That might be the most common reason globally, but not necessarily in the UK where only 5% are intolerant. Many of those can tolerate small amounts such as you'd put in tea/coffee.
Re:Oat Milk Could Change the Way You Drink Coffee (2018) by dragonwriter on Tuesday January 29, 2019 @09:30AM (#19026521)
Lactose-free dairy products are readily available.