Lets say up to level 85 you can level up as fast as you can. At that point you'll choose what to do. There's no point in slowing down when you can't even use all your talents.

Lets talk about the disvantages of level freezing.

1st: you can't awaken/cultivate your ninjas nor you can furthermore level up your equipment so here is a sure loss of power. In 10 levels this quantity amounts to 1-2k of good primary stats power.

2nd:if you are freezing before level 85 you are not able to fully use your talents. For example for azure fang means to not be able to use reserve seal or skewering if you freezing at level 84 or 79, for breeze dancer means to not use sand dust or natural draining. Is not a secondary issue at all.

3rd:secondary stats scales with level. Have you ever tried ninja exams? Where your hinata never avoid an hit or where you constantly fail to control the ninjas with your ccs? That's dued to level difference. In a fight between a level 85 and a level 95 at the same power with close secondary stats what you see is that by being 85 you crit a lot less, you fail to control a lot more and your standard attacks start combos way less.