Based on my experience another reason is simply that mobile development is not nearly as fun as anything else.
By far most of the time is being spent finding out why something doesn't work on a Model X which is sold only in South Korea and is kinda like a model sold here except with totally different chipset and different driver version. In the end you report a bug to the driver manufacturer and receive an answer "This has been fixed in our internal release" and it will never be supplied to the current phones in the market.
Sure there is a similar effect in other areas, but it's not nearly as bad as it is in mobile.
By far most of the time is being spent finding out why something doesn't work on a Model X which is sold only in South Korea and is kinda like a model sold here except with totally different chipset and different driver version. In the end you report a bug to the driver manufacturer and receive an answer "This has been fixed in our internal release" and it will never be supplied to the current phones in the market.
Sure there is a similar effect in other areas, but it's not nearly as bad as it is in mobile.