SUMMARY
When show-paren-mode is enabled, the setting (setq blink-matching-paren 'jump-offscreen) is disabled, which is annoying.
DESCRIPTION
When show-paren-mode is enabled, the only respected setting for blink-matching-paren is "any other non-nil value" which echos matched parens only when they are off-screen. The settings t, 'jump and 'jump-offscreen are disabled.
I can understand why the settings t and 'jump are disregarded since it would just be a redundant functionality of show-paren-mode. But I don't understand why the setting 'jump-offscreen is disregarded. I think it's a better option than "echo match off screen paren" since i) a jump (i.e. a scroll) gives more context than a one-liner in the echo area, and ii) it's very convenient to get a semantic based scroll operation automatically.