Ultimately that’s for the SC to decide. If the PEP passes then I believe the message is that it’s clearly better to have it rather than not. We don’t usually disturb status quo for marginal wins.
Due to the sheer decrease in character count, information density is lowered. I believe this will be a net positive.
Is the equal sign too insignificant for visibility? I don’t think so. It’s already used as a postfix symbol in f-string expressions without issue. And it occupies just as much space as the asterisk that signifies variadic arguments.
But again, it’s up to the SC. If this gets accepted, Black intends to embrace it.