Land Cruiser 250 (Prado) is a light duty Land Cruiser. It is just as capable as the Land Cruiser 300 which is also built on the same TNGA platform. Obvious differences between the two are overall size, engine size, differential size, and transmission.
(without making a comprehensive list, I know there are other components that are more robust).
I do think this Land Cruiser 250 (Prado) is a departure from previous generations because of how the LC market has shifted over the years. Unfortunately the Prado name still has a stigma attached to it. Maybe the 250 will eventually overcome it. The LC 250 doesn't take anything away from the LC 300/200 series (still the gold standard in 4wd.) However the price point of the 200/300 series has pushed it out of reach for a lot of consumers, where it got lost within the noise of the luxury SUV brands. There are clearly market exceptions in a few areas where the Land Cruiser is almost a part of the cultural landscape.
I look at it this way, taking into account marketing, true capability, etc.
$$$ The Land Cruiser 70 Series is the only Heavy Duty Land Cruiser. It is an absolute beast of a work horse that take whatever punishment you throw at it and keep going. It is made to WORK in all sense of the word.
$$$$ The Land Cruiser 300 series is the ultimate capable Luxury* 4wd. It is large, it is bulletproof, it can go anywhere, and can survive in nearly any climate imaginable. *LC centric markets offer non-luxury versions which is really where the question lies in why that isn't offered in the USA. That's where the voodoo magic of sales numbers, public perception, Lexus, etc discussion takes place.
$$ The Land Cruiser 250 series (Prado in some markets) is a VERY capable light duty 4wd going back to the "spirit" of the Land Cruiser. It is smaller, it is tough, it can go mostly anywhere, "get you there and back safely", and can take a lot of punishment.
That's where I think Toyota has maneuvered the Land Cruiser brand. I don't really think it's a bad thing either. The US market kiiiiind of has the 300 series in the Lexus LX600. So there's that. That kind of tells you what the majority of the US Land Cruiser customers became over the years.