Hi,
You posted this question on the 3rd. Until today, nobody has responded. So, I decided to reply to you.
Yes, FIRO-B has some limitations. Just imagine, there are major life events that lead to intense self-reflection or temporary withdrawal from others. Examples include getting divorced, getting married, getting fired, retiring, looking for a new job, graduating from college, the death of a loved one, etc. Any or all of these can affect how a person views him- or herself at the time of taking the FIRO-B.
In one study using students who had recently suffered through the death of a parent, researchers found the Wanted Inclusion score to be higher than in the control group.
Other examples include cultural differences in how needs are expressed. Some cultures don't allow men to show any emotions at all, except in extreme situations such as war or winning the World Cup. Some people might struggle with the vocabulary or language of the questions, particularly those whose first language is other than English. Some people also consciously or unconsciously avoid extreme responses, answering near the middle on all questions. Others may feel pressure from their environment to respond a certain way. The classic example is when the FIRO-B is given as part of a team-building training. People understand they should fit in and support the team and will answer accordingly.