The problem is aside from the 'headline' £15 per hour position, which in itself is mad, I think there are so many problematic issues that are also being endorsed as per the Morningstar -
https://morningstaronline.co.uk/article/b/mcdonalds-workers-to-strike-in-demand-of-£15-an-hour.
I actually think the 'guaranteed hours' is problematic, especially within the hospitality industry (sake of convenience umbrella in pubs, food outlets, hotels etc.) the reality is that guaranteed hours don't exist within the industry because of the nature of demand - as a youth I once worked 60 hours in a week then 8 the next, it was just the way it went. If I wanted a guaranteed 16 hours a week, the company I was working for would have shelled out for me to sit and do nothing. That doesn't exactly help the productivity issue the country has, nor if this was to trickle down into smaller, independent companies (which it inevitably would to remain attractive to employees) then these kinds of places would be haemorrhaging cash for no return.
On a similar note, the having hours 4 weeks in advance sounds fine - but let's say the Maccies closest to Goodison does it's rota a month in advance. We then end up with a replay at short notice - the hours are already in place, so does that mean that they have to try and get by understaffed? Likewise, game gets changed from a Saturday to a Sunday short notice - does it have a far bigger staff than it needs on the Saturday? There's always been a weekly rota in hospitality because it allows flexibility in changes.
Finally, before this becomes too overdrawn, perhaps the most 'dangerous' idea as such is the removal of the youth rate of pay - in that even a 16 year old can get £15 per hour. The issue here is that youth rates are leverage to actually get companies to hire younger people. If that is withdrawn then a 16 year old is competing in a job market with a 40 year old with 25 years of experience - the likelihood of the 16 year old diminishes rapidly. Again, if this is carried over to the hospitality industry as a whole we end up starting to seeing lower youth employment and have to work towards the issues that causes.
The pay issue is daft, when you start scratching you see a wilful ignorance of the environment those workers are part of to promote an ideological standing,
which if carried through could have massive implications. It does nothing to shake the feeling of fag packet economics.