You cannot choose to level freeze and getting 0 disvantages. It's your choice to level freeze and with it comes the fact you do not get free keys for that event.

About this event ramen, yes you are right about the drop rates, but is not written anywhere you are supposed to get the max number of free items from it with no effert or no usage of your free gained resources.

You do not want to use stamina potions this event? Don't do it. Is not necessary to hit the cap every time in every event

P. S. If you are not 1st or 2nd in swb every time level freezing has no meaning.