FWIW, over the course of the last 3 years, I was
- initially very skeptical of the utility of Unicode in code (“it is just a gimmick”),
- then realized that it can be extremely useful,
- then got carried away with stuff like
∂Γ₀(with a bar but that does not render correctly here) - then realized that maintaining code with an excess of Unicode is not that fun.
I am now sympathetic to (implicit, or somewhat rarely, explicit) Unicode-preferences of various packages and try to follow them when I contribute, but I try to use it only when it makes my code significantly more readable.