Key Creature Types Colors in Magic have iconic creature types, which display the mechanics and philosophy of the color
Also, once again, in 1v1 gameplay, you yourself will be one of the 2 players, meaning your equipment, controlled and owned by you, will fall off the creature because it can't be targeted or equipped by your stuff as soon as it has protection from you, making it quite the useless sword
In the Tinker / Welder builds I am very happy to have this as it is serving many more roles than just card quality
As for my favorite or best performing archetype of the format, it may be surprising to some, but it's been Golgari-based decks
That means Tarkir Dragonstorm has plenty of dragons both old and new, but also sees return of the three color 'wedge' factions, in the form of the five clans