I’ll offer a third option between “leave email enabled” and “disable email”: modify site settings so the default is to not send emails. Go to /admin/site_settings/category/user_preferences and check out the email related default user preferences. Tweaking a few of them like default email digest frequency, default email level, and default email messages level should cause your site to send out minimal emails, unless a user makes a conscious effort to increase their email volume by modifying their preferences.
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