Some of the kits there's no reason for them not to be allowed, really, except to keep things simple, which is probably the best reason to not use them.
And I found several amusing semi-contradictions in the spell dates. Under the description of the Mavin's Worldweave
spell, it's noted that the spell was used hundreds of times throughout Netheril's existence in order to keep the northern climate temperate and comfortable. ...but according to the date chart, Mavin's Worldweave
was researched in 3205, only 315 years before the Fall. The maps of Netheril also support the idea that it must have been in use much earlier. Also hilariously, in the timeline of Netheril, it's noted that Sunrest fell in 2202 while research was being conducted on an ultra-powerful version of the meteor swarm
spell...but Mavin's Meteors
wasn't researched until 3384.
And then, looking through spells, some names are credited for spells from more than one school, even though arcanists are supposed to only be able to research spells from their major school. I suppose it could be explained under some sort of collaborative effort, or simply a master or teacher taking credit for their students' work. Of course, some spells also exist in more than one school, so that might also be part of it.
Oh, also, it doesn't seem necessary to make a spreadsheet for the winds; they don't have alternate names. The only table for them is just listing which winds they're under, so there's no need to go back and forth cross-referencing multiple tables like there is for arcanist spells. All you need to know is which winds your god grants access to, and reference that one table. Also, since they're simply granted by the gods, all of them are available throughout the entire timeline.
Anyway, here's the link to the excel spreadsheet: Netherese Arcanist Spell Reference
. And in case someone can't open excel sheets, here's an HTML form