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The "vintage" factor: Older rarities do not follow the same logic

This almost gives a Jhoira, Weatherlight Captain deck the characteristic of a machine in and of itself

Furthermore it fills up your graveyard which makes splits with flashback cards involved extra hard and can be generally useful for many things from Snapcaster Mage to Psychatog

The other possibility for Solemnity in older formats is to use it aggressively as a combo piece

Example of Combos Mask Change + Masked HERO Koga + Favorite Hero First, send "Elemental HERO Neos Alius" to the Graveyard with the effect of "Mask Change" and Special Summon "Masked HERO Koga." Next, equip "Masked HERO Koga" with "Favorite Hero" and attack your opponents monster