Offhore wind is still a relatively small industry, and costs are coming down. Costs are still higher than onshore wind or solar PV - it will be a few years until the declining cost curve flattens out.
Most developing countries are located in the sunbelt (+/- 35 degrees of latitude) where 3/4 of the global population lives. The wind resource [https://globalwindatlas.info/] is generally lower in the sunbelt than at higher latitudes with the notable exception of north Africa.
The sunbelt is where most of the growth in population, energy consumption and emissions is occuring. Here there are no cold winters and the summer-winter sunshine ratio is close to unity. Seasonal storage will not be much needed.
For these reasons, developing countries are expected to depend more heavily on solar than wind. At higher latitudes, the reverse applies.