I don't think that the Scout uniform has been practical since, say, the mid 1960s! When I became a Scout in 1970, the shirt was OK, but the uniform trousers were truly dreadful - mushroom grey cavalry twill<shudder>!
As a 21st century leader, I have two uniform shirts - one long and one short sleeve - a pair of the new style activity trousers and a pair of the new style shorts. I have one new style belt, a Group necker and a leather woggle. I bought the new style trousers, shorts and belt as they became available as I see the wearing of the "correct" uniform as a way of setting an example. But that's probably just me
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Now, those uniform items have to serve for a variety of occasions - mostly "formal", e.g. Scout meetings, SGD, Remembrance Sunday, travelling to an from activities (and not because of any urban myth - I just think it's appropriate) etc. Much as I might want to wear them on activities, the thought of getting them stained, burnt, ripped, etc means that I don't. I've invested too much time sewing badges on them and ironing them for that!
Sometime back in the 14th century when I was in the TA, I was issued with a No 2 dress uniform alongside my lightweight trousers, hairy shirt and wooly-pully. Cost considerations aside, I think that there could be scope for the Scout Association to have a dress uniform - the one we have now - and an activity uniform. Perhaps this is where the i.Scout range is heading?