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@hippy
https://bike.shimano.com/en-EU/technologies/component/details/shimano-shadow-rd.html
"The mechanism rear derailleur, SHIMANO SHADOW RD, is intended for more aggressive riding. Its super low profile design carries many benefits. Because of its low profile and single tension construction, the derailleur does not hit the chain stay in rough riding conditions. The result is smooth and silent performance."
But they also refer to the road RDs as "Shadow"
https://bike.shimano.com/en-US/product/component/ultegra-r8050-di2/RD-R8050-GS.html
"Shadow Plus" is:
"The SHADOW PLUS derailleur design utilizes a spring-loaded lower pulley cage that can be locked out with an on/off switch. When the SHADOW PLUS switch is in the off position, the mechanism moves freely, like a standard rear derailleur with a spring-loaded lower pulley cage. When in the off position, the rear derailleur offers more chain slack and is the best setting when removing or installing your rear wheel."
https://bike.shimano.com/en-US/information/news/shimano-shadow-plus-technology-.html
https://bicycles.stackexchange.com/questions/21061/why-doesnt-shimano-use-shadow-technology-on-road-derailleurs