Hi Leonido,
I understand you have concerns and issues with BuddyPress. To clarify on your original question(s) the theme would continue to work without the plugins installed that you listed. That is to say, the design of the theme would stay in tact. But if you were to remove any of the plugins listed you’d lose their functionalities.
You can of course go down the route of custom development, integrating third party plugins into the theme, and these changes would be safe in the SweetDate Child theme.
Kieran
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