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I personally think it should be on its own page since only one character from that show appears in the Arrowverse, and only for about a combined 20 minutes across all appearances.
Exactly.
The other retroactive Arrowverse shows typically retain their own pages, but 1990 Flash is seen as a direct predecessor to 2014 Flash.
I had a dog-themed avatar before it was cool.It was homaged a lot (casting choices, etc.) and fans of the older show appreciate that, but it isn't seen as a direct predecessor. 90s Flash only factored into the plot during his Dying Moment of Awesome when he keeps Arrowverse Barry from doing the Heroic Sacrifice.
I was asked to help on editing the Arrowverse character page so I checked and noticed that The Flash (1990) character page is under the Earth-90 page. I mean should it be on its own page since it's an independent show? Other properties that appeared in Crisis on Infinite Earths (2019) retained their respective character pages so it's just weird.