Why has Riot neglected pets in the new Rune System and all of the previous mastery systems?

With the exception of the mastery(forgot its name) in beta which increased the duration of pets by 10% which was later scrapped, in the entirety of lol history riot has neglected to add in runes or masteries to buff or customise pets in summoners rift even though death timer and xp runes exist. Now I understand that in the infancy of lol, minion mancers were a few thus it would make no sense to divert time and resources into them but that's no longer the case; acording to lol wiki there are 20 champions with some of pets, half of which are living with hp bars.

I understand the argument could be is that it may make a few champions broken e.g. if malzahar's pets were allowed to stay alive longer than 11 seconds, resulting in possibly the lane being covered with voidlings. But why not start at least small? Like a minor rune that gives pets 10-50 armor (scaling with level) or perhaps give the pets the ability to heal themselves upon killing units like 5-25 hp(scale with level), or a rune that reduces the cd of pets or refunds mana on champion kills or assists? What I'm proposing is at least a minor tweaking to pets. Like why is riot refusing to even interact with champion pets on such a small scale? I've searched far and wide online (riots blogs and podcasts on soundcloud) but found no mention of runes and pets; the closest being ghost crawler mentioning the difficulty in creating minion based champs and how riot for now will stray from that.

And yes I get it most champions have nothing to do with pets but there are 20 whose abilities have some assortmet with them, can't riot at least cater to them? As a large fan of champions like yorick, zyra,annie, malzahar, mordekaiser,elise and azir, i feel significantly neglected by riot even a checked box rune would suffice. I would love a sense of customising my pets, why not being able to name your pets, obviously filltered. And if you're concerned it will be visually clunky perhaps the name will only appear when clicking on the pet to see its stats. I know this may seem like a very minor thing due to whats going with the meta but its important to me and i suspect my fellow pet enthusiasts. I really would love to hear your opinons player and especially a rioter no matter how brief it may be.