If a device has less than 16 MB of Flash and/or less than 64 MB of RAM, it may be unstable in basic operation under current versions of OpenWrt (21.02, 19.07)
+1; maybe get rid of the explicit versions here and just put a link to e.g.:
assuming that will be kept up-to-date?
And for the second warning something like
"it may be unstable in basic operation under versions of OpenWrt from 19.07 onward."
or similar, again with the goal of getting rid of references that need updating? Here having a specific version seems OK, but if we only mention the first version expicitly there is no need to update that sentence further...
Solved by removing the references to "18.06 or later". We anyways link to the 432 pages where more detailed information can be given. (dito for 8/64 infobox).