Why is it that bike manufactures can not put proper mudguards on a bike these days?
It's not that they cannot Bob but it has probably much to do with the purpose of bike ownership over the last half century. Two or three generations now have had no need of a bike except as children and then only as a play thing.
All those small-wheeled, small-framed bikes that kids and teenagers ride around the streets and pavements on, performing bunny-hops and such like, rarely had mudguards and few were ever used for any useful purpose other than as a conveyance perhaps to the newsagent and then back home in time for breakfast and school at the end of the delivery round.
Those bikes were cheap to make and cheap to buy, (usually!), for cash-strapped, heavily mortgaged parents so that's why thousands of youngsters had them and that continues today.
For those who moved on to more serious cycling, road bikes and closely-related hybrids were the thing to have and again, those bikes are frequently pared down and shorn of any unnecessary weight. For many though, they simply stick with what they know and Halfrauds, for example, has always had a great selection of MTBs primarily, unadorned by furniture or fittings but in many cases, unfit for purpose.
The picture in northern mainland Europe, however, is quite different and the cycling fraternity is much larger than here in the UK. Many people commute to work by bike and do lots of local errands on bike, only using car or public transport occasionally. Anyone who has visited Holland or Denmark, two prime examples of a more universal type of bike usage, cannot help but have noticed the large number of machines replete with pannier bags, mudguards, built-in locks, comfortable saddles and handlebars. Those continentals know a thing or two about all-weather cycling!
Three of my five current bikes have mudguards and the two without are FS MTBs which I simply won't ride in mucky weather anyway.
Tom