I believe ethics is relational. The reason why you act in specific ways towards other beings/people is because you genuinely care about them. I think practically this means you have to get some joy from their existence and your relationship to them.
I’ve heard it taught that the purpose of sila is for your own peace of mind and to further your progress towards enlightenment.
I think both are true. It’s also clear that the right thing to do for your peace of mind is not always the easiest or most comfortable thing to do.
In my view, this leads to the conclusion that the first task of ethics is in cultivating goodwill towards all beings/people. If you truly care about other humans and creatures, you will treat them well.
Then, the second task of ethics is to figure out the implications of our actions, as well as sort through the inevitable conflicts of interests of caring for so many relationships, so that our outcomes align with our intentions.
Like with any abstraction, I think a deontological approach can really only paint in the broadest of strokes, e.g. the five precepts.
The Buddha originally had no rules. He laid down rules as monks did things that made people upset or harmed other beings.
But those more specific, less foundational rules were set in the context of certain relationships, vis a vis ancient Indian political society, competing religious organizations, certain technological restraints, a different understanding of science and the universe, etc. – in a different web of relationships.
So, then, as a thought experiment, what training rules might the Buddha lay down today, given our current cultural/technological/political/social context, in our present day web of relationships?
Or, is it better off to have fewer rules, and focus on cultivating the heart? Do rules distract from relationships? Or at the level of specific relationships, do we find rules paint with too broad a brush?
Or both/neither?