Keyword Granting Creatures

So when looking through creatures that grant keywords in typal abilities, I’ve noticed that most creatures have the keyword and grant it to other creatures, but some just grant it to all that have the type. For example, Drogskol Reinforcements, a Spirit, has “Melee” and “Other Spirits you control have melee.”On the other hand, Lancer Sliver just has “Sliver creatures you control have first strike.”Why is there a difference? Is there a specific formatting or rules reason that all typal keyword-granting abilities don’t just follow the Lancer Sliver version? The latter seems simpler.

For clarity, the template is the creature has the ability and then grants the ability to “all other creatures you control”. Slivers use the old template because when you have a bunch of them, it’s easier to add up all the effects.

Creatures Drogskol Reinforcements First Strike Keywords Kindred / Typal Lancer Sliver Melee Melee Reinforcements Rules Sliver Spirit Templating Your Hand