I think it is absolutely normally. More arguments for which idea is on page 7 of the article:

Spoiler: Laptop and PC
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Really GPS PND is not cheap nowadays. All in world is evolving in a spiral. GPS PND is returned to professional or advanced user range.

Only small criticism:
1) Nobody remember what market was overheated a some time ago. All who wanted to have already have one or more GPS PND. I do not see reason to upgrade it because I do not see any really enhancements in technology. Only very small wrist device is exception from this rule.
2) Build-in car navigation systems is new progressive technology but they inherit destiny of car audio device. The most of car audio device read a how many music formats that I do not may keep in mind all of its. But can one of it boast of quality sounds? Any car manufacturer give user a choice?
(In Russia this situation is hypertrophied especially. If you want 17 wheel and headlight washer you obliged to buy build-in car navigation systems without any choice of model. If you want embed new addition equipments in your car dealer immediately bluster to void the warranty. People become the hostages of sellers.)