How is mobility creep worse than utility creep

Give a champion a dash or two and everyone comes out of the woodwork parroting MOBILITY CREEP LUL. doesn't matter if the mobility is accounted for in their power budget, doesn't matter if the mobility is conditional, we'll bitch about mobility creep

Meanwhile nobody bats an eye at HOW MUCH utility supports and tanks are getting. We're fine with permashielding teammates? We're fine with giving defensive spells an extra offensive steroid? It's okay that + most new supports can chain-CC you indefinitely by themselves? basically giving your teammate 12% damage reduction for doing nothing but standing near you, adding enormous heals to AP supports who already have one, this is all fine and dandy?

This is the least fun meta I've ever had to play in. With just a handful of support items you can basically make your entire team, and ESPECIALLY your carry, invincible -- almost purely off of your item actives and spamming your shield button. But at least they're not mobile, right?