I think these are different things being used to different effect. There isn’t anything impure about wanking that makes you more pure if you abstain.
So in this case I would say, do the purification to the extent that your intuition guides you.
I personally don’t treat rituals like I’m going on a date - but I’m more of a low magik person than a ceremonial mage, I’m very interested in bringing contact into my life 24x7 rather then confining it to tiny windows of time.
Energetically, there’s a theory in Buddhism and Taoism, that since sperm carries life-essence, called jing in Chinese, if you release it you release a little bit of your essence, causing you to age faster.
Jing can be increased through cultivation though, and as mages we do docultivation in many forms to get the effect that has on increasing psychic abilities. So by and large I think it’s fine to fap, as long as the need is not controlling you, you’re controlling it, and you’re natural about it (not letting yourself get addicted to porn, basically).