Hello sir, greetings of the day.
As per your query, there are certain disadvantages which come with the unapproved or CMDA plots. Chennai Metropolitan Development Authority (CMDA) was set up as an ad-hoc body in 1972 and become statutory body in 1974 vide the Tamil Nadu Town and Country Planning Act 1971. While some people in India, are okay with buying unapproved land, some are not. It is common in some parts of India like Trichy and Coimbatore etc. in other places like Chennai, people do not feel comfortable buying such lands.
Some risk factors associated with CDMA are:
The municipalities and corporations which follow stringent rules, may create some problems for the unapproved lands.
It doesn’t offer international roaming,
As the number of users increases, the CDMA system performance degrades.
Due to its relatively new GSM, a network of CDMA is not mature because it is relatively new with GSM.
The code lengths can cause delay.
The near-far problem arises when we are using CDMA techniques
Higher cost due to the greater equipment
Reduce capacity because gradual transfer increases the use of radio resources.
Hope this solve your query.