Only watched it once at the cinema but wasn't the magic in Strange sold as using energy from another dimension?
That said I think the MCU is definitely moving in a more "mystical" direction, Ragnarok mentioned magicians for example and did less to try and STEM the abilities we saw plus if Strange potentially takes Starks role(very similar characters, I could see Strange playing off of Cap in a similar fashion to Stark) as leading the Avengers if the latter is killed by Thanos it could potentially go further that direction.
Keeping the style/tone of the MCU evolving is probably a smart thing for Marvel if they don't want audience burn out. I remember around 2012-13(especially for the Thor sequel) hearing quite a few people state they were tiring of it but the style of Guardians and the Russo's helped limit that it seems, certainly it did for me.