I know it sucks as someone who plays almost only immobile melees, but it would be an issue if this wasn't the case. The enemy ADC has to perfectly kite you for like 10 seconds focusing only on you if they want to survive while all you have to do is get close enough for 1 second and kill them. It is actually pretty fair design. You usually have to take a flanking route to kill an adc who is good at kiting as an immobile champion.
I play Taric a lot in top lane and the jungle and have troubles with ADC's if I can't stun them but that also comes with the advantage of being way stronger than them in all other aspects. If I miss my first stun, I can just reset my cooldowns on minions until my stun is back up entirely ignoring them while losing very little health. There have been times where it has taken 3 tries of them shooting me the entire time and I still end up killing them with a stun and 3 autos when I finally hit them while they have been shooting me for the past 12 seconds straight.