Like LunaMoon said, it’s all very personal. Generally speaking, I’ve never listened to lambda “less is more” recommendations per se (and I’m still alive, benefiting from all my fields) but sticked with the specific official descriptions though. However, for those who feel more “in a hurry”, the 3-4 limit mentioned by _OM is a wise choice by all means.
As for Mjolnir/Thor and Michael, I’m “wearing” them respectively for 8 and 6 months (Thor only at night - it’s on my bedroom wall). After the adaptation process, I think I’ve managed to integrate them both (but I already had longtime affinities with Thor, before meeting SM). Because yes, this is a part of the overall integration game.
Just my personal optic though. Do as you wish, of course.