Because, like almost everything else in the industry, maps are tendered for, and since they're not obviously safety-related, don't affect vehicle life or performance and are virtually impossible to lodge a warranty claim on, what you get will be the cheapest on offer.
I had the voice "updated" (reluctantly, the service guy "hadn't heard of it") on mine at the last service and the invoice noted that it had been done (with a disclaimer that suggested I mightn't like it,) and they were more-or-less correct — some things improved, others got worse.
After nearly three years of dealer duckshoving I've finally contrived to update the original maps and yes, the latest, (officially dated May 2016,) whilst it has some changes is far from up-to-date.
If Google et al can do it?
I had the voice "updated" (reluctantly, the service guy "hadn't heard of it") on mine at the last service and the invoice noted that it had been done (with a disclaimer that suggested I mightn't like it,) and they were more-or-less correct — some things improved, others got worse.
After nearly three years of dealer duckshoving I've finally contrived to update the original maps and yes, the latest, (officially dated May 2016,) whilst it has some changes is far from up-to-date.
If Google et al can do it?
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