The mechanic originated in Throne of Eldraine, and acts somewhat similarly to split cards
Thats why each person has to decide for themselves whether theyd rather invest their own time in researching, listing, and shipping Magic cards, or take the easier route and accept a slightly lower profit in return
Each one has a different color identity and ability, but sometimes it's fun to build in a single color
You arent really generating any tempo with a wasted Strip Mine, and the only reason I can see this as a useful tactic is if you are potentially shutting off the opponent from getting to a specific mana production you are concerned about (for example, hitting 4 mana to cast Jayemdae Tome, The Abyss, or some other problematic permanent)
People didnt realize how powerful Iono was when she fist came out