ARURF Lulu's Shield

I know it is arurf which means there are still a lot of champions that have abilities to spam shields. However despite there being a 50% reduced scaling on non ultimate shields (I think it is 50%) Lulu's shield is on such a short cooldown, she can regardless of minions sit and tank inhib and nexus towers with her low cooldown shield and not take any damage past her shield before the cooldown is refreshed again and she can continue to push towers without the help of any minions or any other champions to support her with healing. To be honest, me being on the receiving end of this make me think that maybe her shield should have a longer cooldown or have a reduced strength or maybe have towers on arurf do more damage to shields so this can not become a legit strategy to win games. I see it as cheating, an unhealthy mechanic that requires at least one person to always keep watch of your towers to make sure a Lulu or any other champion with shields that can also do this does not come out from the fog of war and 100 to 0 one of your towers and run back into the fog of war before you can even stop it. Does anyone else feel this way because I really do not like this strategy and thinks it is really unfair yo the other team despite them winning or losing. That or I'm really salty about that game and everyone is having to much fun with arurf to care about deciding what actually is fair and is boundaries of how wild arurf can get.