Bedrock has always seemed like a rather ugly texture to me, and it ruins the look of builds it pokes up into. While aesthetically I'd much prefer some sort of paste or other item I could apply directly to bedrock to change its texture, I suppose such implementation of this would result in the use of entities and thus increase lag (and increase it dramatically when used en masse). Therefore, if bedrock is exposed to air on top and has a non-bedrock block in one of the 16 spaces surrounding it (same y level and 1 level lower) it would use the non-bedrock texture instead.
Alternatively, this could be a worldgen option (almost like a texture pack, but not quite), with retexturing only happening if a material vein would have included the bedrock block position. for example, if you chose to make bedrock appear as smooth stone and worldgen caused a vein of granite to generate (in such a way as to include where the bedrock was) then only those pieces of bedrock that would have occupied the vein would take on the vein texture. Ore and liquids would be exempt, possibly block lights as well (light blocks without light values would not make sense, and I'm not sure if those properties can be transferred to non-light blocks).
I mean, personally I would just say the Bedrock texture should get changed to something less ugly. Based on the entirely new textures we got recently Mojang is clearly okay with making changes to the appearance of items that have been in the game forever. That seems like the easier and less resource-intensive fix anyways. Plus this could get really confusing to have blocks that look breakable but actually are not.
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