We actually have top-loaders in the British Isles too
I believe that this is a question of market-driven production. Top-loaders were quite popular here from the 1960s through to the 1970s at a point when automatics were NOT the norm, and considered luxury purchases. Originally (in the 60s) automatics were generally bought by people on middle to high incomes, with larger houses and more flexibility in locating a washer. In the 60s, consumers could choose between a range of top-load, front-load and the unique half-way-house Keymatic. Kitchens weren't fitted with wall-to-wall cabinets and counter-tops, so any style washer could be accommodated. In the 1960s an automatic cost about £120 - one whole month of a healthy middle-manager's salary - about £3000-4000 grand today. In the 60s and 70s, the Hotpoint top-loader was considered very good in terms of results, spin-drying, capacity etc.
By the time cheap Italian automatics (mainly Indesit front-loaders) came in the 1970s, a trend for fitted kitchens meant the market swung to front-load machines. These machines were less than half the cost of a top-loader, and ultimately cheaper than the ubiquitous twin-tub, driving the UK manufacturers to cut production costs as much as possible to compete. Top-loaders were still popular for consumers with laundry rooms, but the market had swung so much to front-loaders that there was little reason to continue production. The traditional top-loader is much more complex, requiring a gear-box, brake etc etc, so could never be produced as cheaply as a front-loader. EU water and energy labeling finally killed the UK top-loader off.
There is still a market for US top-load washer and dryer pairs here, generally sold to the luxury market by Whirlpool and Maytag through specialist appliance/kitchen-porn 'lifestyle' suppliers - ironic as the models sold here are BOL US models. Top-loaders were even more popular in Ireland than the UK through the 70s and 80s with GE filter-flo pair marketed alongside the UK Hotpoint model - the GE was very popular amongst guest-house owners, hospitals, holiday parks etc - I bet there are still examples out there!
Personally I think there is very little to argue in terms of performance between top-load and front-load (I admit there is much to argue in terms of water consumption) - we have a Hotpoint Top-Loader and it washes as well as a front-loader, I think it rinses better and it is much quicker, and I manage to get brilliant whites!!