deprecation of set_error_level() callback $errcontext argument

I understand the $errcontext argument to the set_error_level() callback was deprecated in 7.2. Apparently, this was deemed "not useful", but what's the alternative? I understand that debug_backtrace() reports the arguments on the call-stack, but... just the arguments - no local vars. I understand you want people to use a real debugger, but there's also such a thing as error-handling in production - this information was logged and was useful in conjunction with Sentry, and probably other error-handlers. But this feature has been removed, and there's no alternative?