Another day, another Suica related announcement. JR East ticketless Touch and Go Shinkansen service for Suica and other compatible Transit IC cards will be expanded to include all JR East Shinkansen lines in March 2021. Touch and Go differs from Eki-Net Shinkansen eTickets in that Touch and Go uses the Suica balance for Shinkansen fare, eTickets do not.
The service is very simple: register Suica, PASMO, etc. at any JR East station pink recharge kiosk for Touch and Go, or register Apple Pay Suica using Suica App. After registration all you do is go through the Shinkansen gate and get on a non-reserved Shinkansen seat. A typical use case looks like the diagram below.