Yes, but most of the people expect watching TV with sound without buying extra device. Nobody stops you from hooking it up, but speaker cost is such low it would be more expensive to make special small series without speaker than with speaker. Personally I also use speaker only for minority of time when kids watch TV, in evenings we watch TV with wife through headphones to enjoy experience without disturbing kids/anyone.

You can also always disconnect the speaker if your religious belief is against speaker in TV, though you might void your warranty and I would understand more, if you would have issue with built-in microphone than speaker.