thick/thin chainrings have been A Thing in mountainbiking for a while now since wide ranging cassettes mean you can get a decent gear spread allowing you to ditch spare chainrings
combined with a highly-sprung clutch rear mech they mean you don’t need any guides or catchers to keep the chain on
this has moved over to CX (see the SRAM CX1) with a collection of thick/thin CX ready rings available from different manufacturers
been running a ROTOR wonky thick/thin ring on a baggy old 9spd system and since i’ve started using a 10spd chain on it it’s worked well, although at last week’s incredibly muddy race it dropped the chain several times thanks to the overloading of mud on the ring and in the mech making the chain all baggy