Meanwhile, newer additions to the format like Solitude, Fury, Unholy Heat and Omnath are punishing for creature decks
Take the Insiduous Roots+Tortured Existence+Tyvar, Jubilant Brawler combo, for example
Teysa, Orzhov Scion Teysa, Orzhov Scion gives you an excellent incentive to play small creatures and tokens without giving you ways to do so
"More fun" in this context means "more chances to make that crazy play you imagined when you were building your deck, but which would only be possible if you combined many cards and/or had a lot of mana"
So if you didn't have token creatures, Vehicles were unplayable
Starfall Invocation lets you retain some of that as you deal with your opponents, so its a nice new option to have