We validate on a number of Cosmos SDK chains as well as Polygon for a few years, and are fully supportive of this upgrade, as well as PIP-43. Life is much better for operators and users on a modern Cosmos/ CometBFT stack and this would be a major improvement to the Polygon software.
The coordinated upgrade is slightly more painful / risky from a node operator standpoint, but we’ve done it many times before with other Cosmos based chains, and this should be a one time event.