Even if his method makes him learn more Kanji (with Anki?), us WaniKani users have thousands of radicals that help us learn Kanji, even ones that are not in WaniKani. Also, WaniKani is just easier to use, you have more control, and there’s a huge community that makes you feel great and comfortable. I doubt he knows
2,900 Kanji. You should test him (and watch him). Don’t listen to him. Follow the way that makes you feel the most comfortable and happiest. 
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