The main reason to go through support is to make sure there's a bug logged if they can dup it.
Hint for others that may not want to wade through support. Put your foot down! Don't be mean, but don't let them push you around. For instance...
"I'm calling to find out if this is a known issue. I've tested this several times and it always has the same results. Will you test it as well? No, I'll not try some other testing issues, I'd like to know if YOU test it if YOU get the same results. You don't want to test it yourself? Will you then please escalate me to someone who will? Again, NO, I will not do more testing here. You can escalate though if you're unwilling to test it yourself, I'm patient. Thanks"
When there's a bug, it needs to be reported up. It needs to have a public facing KB for others, and it needs to be taken seriously. How do you know if it's taken seriously? Another example:
"This is a known issue? Will you please tell me what release it's slated for, for a fix? Does this have a bug number you can share with me so I can follow-up on it at a later date? No, a KB number is not enough, I need a bug number. Thanks. Can you indicate when this is expected to be fixed? No? Can you escalate to someone who can please? Thanks."
Being firm like this helps the navigation of support go a LOT faster. :D Just saying...