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At the moment di2 105 would sit as close to Ultegra as to be too similar price-wise
That's not an impediment in itself. When I was a boy, there didn't seem to be an exploitable gap between the BSO grade Tourney parts and Golden Arrow 105, but Shimano have dropped Tiagra, Sora and Claris into that space.
The decision isn't based on any absolute or relative price difference, it's based on price elasticity of demand. If nearly everybody who wants electric gears is also insensitive to a couple of hundred pounds difference in initial purchase cost, then there's no need for 105Di2
gbj_tester
Agreed. At the moment di2 105 would sit as close to Ultegra as to be too similar price-wise