I think quality assurance is very important but even with vocaloid's long testing a lot slips through. I wish Gumi English had a proper update instead of the custom dictionary that Internet put out to fix her vowels. Or I wish tonio worked with the @ phoneme with out crashing the software. Or even Daina being able to say smile correctly. I think it hurts English vocaloids the most because of how complicated they are. I think synth v has done a great job so far with their updates they were quick to fix the maki English ai glitch and rikka's pronunciation. Native instruments does it too so it's not uncommon for Yamaha.
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