That's exactly it. Everyone has different uses. The difference between a Heavy Duty vehicle and a Light Duty vehicle is weight capacity. A 250/Prado, "out of the box", will have vastly better ride and more "capable" than a heavy duty LC70 series. But the LC250 has a cargo capacity of less than 1,000 lbs. The LC70's cargo capacity is ~2500 lbs. The "capability" is in carrying a heavy load over rough terrain over thousands of miles over many years.
The Australians have had all three lines of Land Cruisers since introduction. They called the Light Duty line, the Land Cruiser Bunderra, actually. There are at least a dozen companies that convert Land Cruisers to Dual Cab with extended wheelbases for extra capacity. They always choose the Station Wagon or 70 series as the base vehicle, never the Prado.
My Land Cruiser Wagons are built up. Loaded, I'm about 2,000 lbs over curb weight plus towing. It's the Bees Knees for what I do. I don't daily drive any of them. I'd much rather daily drive a car than any SUV. I don't need carrying capacity on a daily basis.
I have nothing against Prados. I considered buying a GX460 and doing a
Prado body conversion... I just don't need that type vehicle. Just like a lot of 250 owners don't need a heavy duty Land Cruiser. It's not the best tool for the/their job at hand.