Sadly, today's regime means that tidiness for its own sake is not valued. This applies to the wider world, not just the railway. For the railway, unless a messy site can be positively identified as a hazard or a likely potential hazard, there is no business case to tidy it. Ballast bags are everywhere - some may be used at some point or may become so contaminated by weather, etc., after a decade or more as to be considered unusable. Rails and other metal items may be left on site because they are replacements for future easy use, and they too may rust to the point where they are useless. Of course smaller items are easy targets for vandals, but large rails, switches, etc., are not, but they can gently rust away over many years and the point of leaving replacement rail on site as a quick job is completely negated.
The tidiness of the railway estate used to be a point of pride but it was also enabled by far, far less stringent work/safety procedures for p. way work, cheaper labour, etc. Those days are gone.
The same lack of tidiness is also now embedded into the railway's public spaces - stations are cluttered to the point that many signs obscure each other, equipment cables are drooping everywhere and a general feeling of messiness abounds.
The travelling public are now so used to a messy environment, on and off the railway, that there is almost certainly no case for changing the regime, unless a real safety problem exists.