When tracks started moving to the bright halogen lights, those visors became necessary. Now the trend is moving to more power efficient LED lighting and both are much brighter and more intense than the old amber lighting.
And for those of us fans that are annoyed by the constant ride-hopping in open wheel, the names on the visors are really helpful.
Late Models where just discussing visors, it's not open wheel, but it's worth the read and the reasons may be applicable to sprinters as well:
https://racingnews.co/2019/02/03/mar...n-dirt-racing/