I think it would be helpful if Amazon added an additional Standard size weight. Currrently it goes in 500g increments then from under <1.9kg to under <2.9kg. The fee increase between these is quite significant in UK and this is why many sellers will be caught out by the dimensional weight changes, making their offering unsellable vs. retail (and other online retail).
Interestingly many Vendor Central Sellers (those selling to Amazon) product prices are still extremely low in these categories (i.e. where product is light but a bit bulky such as a bowl or plant pot) indicating that they are not hit with the dimensional weight changes.
3rd party sellers are big, big loses out of this unless some tweaks are made to their rate table.