Test::Most, not Test::More. That's a very important difference here.
Sorry, I'm just used to typing Test::More.
But that doesn't change my arguments. I wouldn't want any module to turn on a pragma in the calling scope - unless that is its specific purpose. turn::on::all::pragmata should turn it on. But not something from the Test::* namespace.
I'd say that reducing boilerplate code is one of the main advantages of Test::Most, so I think it will be logically if it will enable strict and warnings. The people who don't love surprises and magic can always replace it with: