The phrase "are less developed" is correct and usable in written English.
It can be used to describe something that has not reached a certain level of growth or advancement compared to something else.
Example: "The regions in the country are less developed than the urban areas, lacking in infrastructure and resources."
Alternatives: "are underdeveloped" or "are not as advanced".
For more complex equilibrium functions, theoretical methods are less developed.
Greenwich's bond experts could export their skills to Europe, where such markets are less developed.
Facilities are less developed on the western half of the island, although the country's best natural harbours are located there.
Cancer is not a rare disease but cytogenomic cancer diagnostics efforts are less developed.
Qualifications in this aspect of games creation are less developed in the UK but there are still courses out there.
Farage is concerned about immigration from the so-called A8, but his remarks appeared to be aimed at Romania and Bulgaria because they are less developed economically.
Farage is concerned about immigration from these, the so-called A8, but his remarks appeared to be aimed at Romania and Bulgaria because they are less developed economically.
Both technologies also have the potential to produce power more cheaply than conventional methods, but they tend to be more costly because they are less developed.
While we already have alternative ways of producing electricity –renewables and nuclear – technologies for replacing oil in transport and gas in heating are less developed.
We present evidence that 20-day adolescent, but not adult, cannabinoid exposure attenuates adult cortical oscillations predominantly in cortical areas that are less developed in adolescence.
Discriminative systems that can deal with graphs in input are known, however, generative or constructive approaches that can sample graphs from empirical distributions are less developed.
