I've no strong feeling other than on the extra expense it's going to put on families with kids already there who aren't already wearing trousers and shorts. I hope the school has thought on that and the waste these changes can cause.
I do think it's silly to claim 'gender neutral' as a reason, when they could do as many schools do and just have all options open to everyone.
I’m curious what people mean by trousers not ‘fitting’ them well.
Fitting the waist, hips, and thighs comfortably and remain comfortable over the whole day. Anything rigid is going to fail that for me, and formal trousers are generally rigid.
This is a sensory issue my older daughter shares - she did not wear trousers in secondary school, she wore long skirts well below her knees (while many girls at her school fit the stereotype, there were also girls who wore well below the knee and even ankle length skirts). She now has trousers, but they're all the elasticated waist, very wide leg, loose and flowy kind, and she predominately - while working in a primary and biking everywhere - wears skirts and dresses.
Personally, I'm curious what people mean by skirts are 'not practical'. I've worn mid-calf length skirts with 4 kids, hiking, gardening, rock climbing, working in an active job. All four of my kids, even the boys, at some point gone running around and tumbling in the grass in a skirt when they were little. If you're wearing anything overly rigid or just not used to it, I get it, I even get in certain professions - my adult son was convinced by an instructor cut his waist length hair short and there are a lot of precautions around clothes in a ship engine room, but generally life? People - female and male - have worn skirts and gotten on with life for ages. They, like trousers, can be made and worn in practical and impractical ways.