+/- .7 or .3. Absolutely useless for hdr, or anything else for that matter!
err, that's hardly useless (for HDR or for exposure management), let alone 'absolutely useless'.
If you really want the (recently fashionable) overcooked HDR look, use RAW and make adjustments. It's not hard to do.
+/- 0.3 is very useful in a lot of situations where light is tricky or variable, as is +/- 0.7. You can be dismissive and absolute about it if it makes you happy, but alternatively, you could try and learn about making use of the tools you have and getting the results you want.
I saw your other post where you lambasted Sony for not replying to your emails - you might try a more engaging approach, rather than saying what you have is 'absolutely useless', you could talk about the pros and cons of a more exaggerated compensation (which would perhaps only be useful for exaggerated HDR, no?

).
You could also gain a lot from the many many free online resources which can show you how to get that obvious HDR look with +/- .3 or with a single exposure (you don't actually need exposure bracketing to do HDR)