I agree with you here. I cant see any reason why anyone should scale down for their winter fishing anyway. Ive always used a hook size that matches the size of my bait so if im using a piece of Peperami, a mini tiger, a grain of maize, a chick pea or a boilie no bigger than 12mm, then i use a size 10 hook. If im using a 15mm boilie a size 8 and a 18mm boilie or bigger then a size 6. I practice this method for 12 months of the year and 65 percent of my fishing this year has been done with a size 10 hook
Considering during winter i prefer to use smaller baits it will be generally a size 10 hook i use anyway.