I've said this before, but I think you're overplaying the "downsides" of having a dGPU. It's there if you need it. I leave it on (turn off automatic graphics switching) when connected to power and it provides a slightly better overall experience but if you don't care for it or the minor annoyance of turning automatic graphics switching on and off just leave switching enabled all the time.
But here's the thing, if you buy the mid-tier processor and storage option, Apple throws in the dGPU anyway. Granted you can configure the cheapest 15" rMBP with the mid-tier's processor and storage only but then you're paying virtually the same anyway but without the bonus GPU so I don't know why anyone would do that.
I think if you only do writing, browsing and coding or similar and want the absolute best battery life possible, get the slowest/cheapest model and then increase storage to suit. You won't notice a difference between a 2.2 and 2.5 GHz i7. But I think the effect of the dGPU
is noticeable even in general everyday use and certainly if you do anything like photography, which a lot of people do.
So buying without dGPU also limits its potential resale value to customers who do photography and video.
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No!!!!
I've been in this thread since I was waiting and waiting, then when I caved and bought the 2015 model a year ago. It's like a part of the furniture!