Why are alkaline batteries (AAA or AA) made to be 1.5V while

In practice, alkaline batteries and rechargeable batteries can be used interchangeably in sets. They have only different voltage characteristics.

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» Are all alkaline battery brands the same?

ACDelco Super Alkaline AAA Battery (48-Pack) AC274 - The Home Depot

Maplin AA LR6 and AAA LR03 40 Pack Alkaline Batteries

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Energizer Max Alkaline AAA Batteries - For Multipurpose, Digital Camera, Toy - AAA - 1.5 V DC - 4 / Pack - Kopy Kat Office

AAA Alkaline Battery (LR03) - Verbatim Hong Kong