Honestly if that is your biggest concern with the camera then you should get it.
I was blown away with how nice this camera was to use.... which is why I probably use the word 300 times in the video.
Yes its annoying, but there are solutions. Personally I don't use Lightroom, but I assume you could just sort JPEG's and DNG's out and then delete the JPEG's no? Obviously its an extra step, but I think this camera is nice enough to make you feel okay doing it.
Best,
BH