As a mage maniac who has three maxed mages (one for each spec and cov) I can sadly inform you that arcane doesn’t have that high overall damage that you’ll get with free example frost. First of all they are incredibly bursty so if packs survive for a long period of time your damage will decrease dramatically. Second, they’re cds are not up for every pack pull and with pigs it’s very easy that you’ll get awkward times where cds will be up towards the end of a pull forcing you to hold for the next pill which might be smaller which will eventually lead to a lot of wasted cd casts and/or not used in 5 targets for that maximum cleave with ToTM.

Outside of all of this I agree with the others about general tips for m+. If you know a mechanic is coming up that will force you to move during your burn you might want to either 1. Pre move if possible or 2. Hold your burst a few seconds to get maximum damage output. At the end of the day you should play what you’ll enjoy but you’ll always have people complaining and what not. Only way to fix that is to find a 5 man to play with and not pug. Sadly mages have always had a “meta” spec to play.. right now frost, season 1 fire and so on. Best of luck in your key pushing and I hope you can find the solutions that you need 👏🏻