Originally Posted by medic75

RD-RX400 SHIMANO SHADOW RD+

• Similar stabilizer technology and design as premium GRX series
• Compatible with existing Shimano mechanical 10-speed road ST
• Max. cassette range: 36-30T low)
• Max. front chainring range: 16T
• 41T capacity
• 303 g

This one shows a 16T chainring range for the crankset. I believe Shimano is resisting the dedicated 1x systems. In addition that that, who would by a 1x system with a 36T max low cassette limitation? Finally, a 1x system with a maximum of a 36T cassette & a 41T capacity would give you a -5T high gear.