Offset should be offset and, along with size, and name are the primary information
Should include if the partition is marked r/o or not
Correspondence of OEM and OpenWrt partition locations, sizes and names should be very clear (both for underlying flash, as well as in this case where the UBI volumes change significantly)
The NOR flash and the NAND flash should be completely separate from each other
LEB, PEB count, at least for me, is "noise"
Be aware that chip types change, as do drivers. Interesting if, for example, chip 1 is "SPI NOR" and chip 2 is "SPI NAND" or the like. "m25p80" is not correct, even for the driver. "jedec,spi-nor" is the current driver.
If you want to prepare a table that is equivalent to that suggested by tmomas in a vertical format on a "personal" page for suggestions (I didn't realize that you were live-editing the device page itself), that would be a good place for comments.
I'd stay away from making factual statements in areas that you may not be familiar with. Be very careful about things like the chips in use, drivers attaching, partitioning, boot sequence, the MTD subsystem in general, how both combined firmware partitions and UBI is handled by the boot loader and the kernel.
But there are a lot of routers, where physical order of partitions is different from mtd order, such as first partition might be listed as mtd5, second as mtd4. Some of those routers don't even have dmesg on stock firmware.