I find the reluctance to get on board with this astounding.
It primarily space and complexity.
I currently have to have 3 indoor seperate bins for general waste, cardboard waste and other recycling because all have to be kept seperate. The general recycling has to be cleaned and dried. All of which I do. There is a fairly complex set of rules as to what can go in what bin, so I find myself at least daily checking them to make sure everything gets filed correctly. e.g. only some cardboard goes in the cardboard bin, some types have to go in the general recycling. Only some colour plastics can the general recycling, others have to go in general waste,
I then have 4 full sized wheely bins outside in the space behind the house that is 2m x 2m. That's it. Those bins each have to be wheeled down an alley that is just wide enough for them, each week. That means I am constantly juggling them like one of those puzzles where you slide the square to make a picture - so that the 'next' bin due is the one at the front.
I am not allowed to keep those wheelies in front of the house and, if I did, they would take up drive space for a small drive that is currently full.
If I add another 2 food receptacles - one indoor and one out - I will then have 9 waste vessels. That is simply bonkers to me.
Outside, the only places I have to add another caddy of any description is on top of the four wheely bins and moved each time I need to use that bin or in front of the house (where it's not allowed). And I don't live in one of the (many) victorian terrace houses around here that cannot fit all 4 wheely bins into the front garden and so have to leave 1 or 2 out on the pavement to be walked round.
Improving recycling % is important but the answer cannot be to constantly add yet another bin and yet another set of rules to homeowners. Meanwhile, certain industry wastes a phenomenal amount of rubbish and manufactuers are still allowed to use packaging 2-3x the size of the product to make it look like you are buying more than you are - and wasting all that. There also needs to be legislation about how food offers are put together so that people are not encouraged to buy more than they need just to get better pricing. Things like 3 for 2s could be better spaced out so if you buy two items in a period of time you can then claim a 3rd free within another period of time; stops you having 3 items all at once and ending up binning some.
Food waste should be allowed in the green bins for those that have them. That increases the food composted without wasting energy and plastic on yet another bin.
And I also think all councils that have to compost green and food waste, should be made to provide that compost back to residents for free or at cost price. It's currently all ar too much 'you have to do this now or else'.