I will admit that the type used isn't always best. In the good old days a 3lb or 1.5kilo BCF was used and was good enough to deal with most things.
One forces went to the to the extreme of 2kilo powder plus in all vans a 6 kilo Powder just a few years ago.
We use the humble 1l AFFF, which in untrained hands is a bit duff, but better than nothing. It doesn't cost our force 5 figures either although that's because we don't service them annually and have a pool stock at each station, swapping if used or out of the green, and don't use the main contractor who does premises extinguishers but a far cheaper local firm.
Would you remove the first aid kits? If not, then why the extinguishers as they have proven to be handy over the years, but of course no-one bothered to keep stats.
You could save a lot of money instead by moving to disposables that are service free, such as the Fireblitz and Britannia 900g Powders, BS6165 approved.