Actually that's all the faster it's grown in. I'm shaving my neck still but only now had to trim back the mustache. The Chin and Neck grows really fast and thick but the sideburns are thin and slow to grow in and the mustache is somewhere in between.I see you compromised on the beard, there ,but looks more trimmed to my eye
I never have learned how to trim one so I've generally let it just grow until it got annoying then went after it with scissors until it was a more presentable size. I've let a couple of the hair places in town have a go at it but the results are about equivalent to said scissors. Contemplating getting one of those fancy trimmers but I'm sure all the little plastic combs, etc. will be lost in short order and I really have no clue how to use one. Had to teach myself how to shave as a kid and never picked up any of the finer points.