The diversity of of the the hardware doesn't really matter since Android is using a modified Linux kernel, all of the drivers are embedded in the Kernel so that eliminates issues with hardware differences. I have yet to download or transfer to a new device any app that didn't work on the new device. After all if Android was so cumbersome to write for due to the various device manufactures there wouldn't be thousands of apps available from googles play store. That makes does sense and maybe I'm not up to speed on some of this but it seems to me that Android, being a platform should have many simialites between devices and thus far from impossible when it comes to writing an app. I'm not saying it isn't more difficult to write Android apps but given the number of people out there who prefer that platform, I think its time they start. If what you're saying is the main reason for manufacturers not writing Android apps then why do they write for both Mac and PC's? Again I may lack some knowlege in this area but it seems that having a multitude of PC manufacturers and devices out there that you would run into the same problem writing PC apps and yet most audio manufacturers usually do have apps for both platforms.

That does make sense and maybe I'm not up to speed on some of this but it seems to me that Android, being a platform should have many simialites between devices and thus far from impossible when it comes to writing an app.

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