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It's still considered acceptable. If you really want to cover your bases, include a definition at the front that reference to one gender imports all other genders, unless the context requires otherwise, and explain that you'll be using "he" for the sake of simplicity.

Edit: As per below discussion, using a single gender pronoun is not normally good style, although it is acceptable. The main reason to use it is when it's more important to avoid confusion about singular vs plural "they".

It's still considered acceptable. If you really want to cover your bases, include a definition at the front that reference to one gender imports all other genders, unless the context requires otherwise, and explain that you'll be using "he" for the sake of simplicity.

It's still considered acceptable. If you really want to cover your bases, include a definition at the front that reference to one gender imports all other genders, unless the context requires otherwise, and explain that you'll be using "he" for the sake of simplicity.

Edit: As per below discussion, using a single gender pronoun is not normally good style, although it is acceptable. The main reason to use it is when it's more important to avoid confusion about singular vs plural "they".

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source | link

It's still considered acceptable. If you really want to cover your bases, include a definition at the front that reference to one gender imports all other genders, unless the context requires otherwise, and explain that you'll be using "he" for the sake of simplicity.