From my experience, it doesn't seem to be quite as popular nowadays, when you often can't take a turn off to play an expensive enchantment with a static effect, but the demand for this card never goes away despite reprint after reprint
Yesterdays stream revealed that each Star Trek Welcome Deck will include two unique, non-main set cards, one rare and one mythic
They play creatures with enters-the-battlefield triggers because they like getting the value there, and they like getting that value again
Keep in mind, Jeskai Tempo is not strictly in the middle five decks however is actually cheaper than all of them and is in many players view more a powerful archetype
For starters, Pride Sovereign gives us another good Cat lord without needing us to go all-in (similar to Regal Caracal)
It is simple to use and very hard to take down, making it a reliable choice for players who want to overwhelm their opponents with pure attrition and consistency