we all covered this assistance stuff pretty good at the past San Diego seminar, Assistance and any special exercise should be added for a reason and not just because you can.
Meaning if it aint broke dont fix it. You add things for a reason when your progress stops long term.
Your training should be and stay as simple as possible and then you add thing to address a specific weakness that the large compounds are not getting. Your aim should be the opposite of the western attitude of if a little is good a ton of shit is great. You should do the minimal stuff it takes to make progress. Usually more crap added leads not to progress in the long term but stagnation
it all depends not on how long youve been doing things but training age which is determined by progress or lack of when religiously following a quality program, not even loads you are using