Just to add something here... I'm pretty sure Weber's new stance on this is, at least for the new 2019 Genesis II models, is that the cast iron grates are reversible. Pointy side for dedicates like fish and such and flat side for steaks, burgers, etc. Their website mentions this and also the literature that came with my Genesis II mentions this somewhere.
The photo in the link below is the porcelain enamelled cast iron grate from a 2019 model Genesis II SP-435. It can clearly only be used flat side up, and the circular segment is right over the sear station. I'm pretty sure the grate in the 335 model has the same limitation. So if that's their new stance, it hasn't been universally deployed.
https://tvwbb.com/showthread.php?77361-Grates-upside-down&p=853052#post853052
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