user4833: I was wondering, why opinion based questions are not allowed ? Can't we have discussion(s) on questions ? I understand this is question-answer community but if it is not good idea then can we request new feature for discussion ? :P 
P.S: Chat rooms are for discussion but I doubt it will get attention of many users.  

user3624: In addition to the answer from @WYSIWYG; the entire StackExchange network generally discourage opinion-based questions and discussions (see e.g. this  and this post at meta.stackexchange.com). StackExchange sites are not discussion forums but places to ask and answer specific questions. If you want to have open-ended discussions you should choose another platform, or use the chat feature.
On the other hand, discussions about the policies and features of BiologySE or other StackExchange sites are allowed at their respective meta sites.

user3340: Opinion based posts are those that cannot be rationalized with either logic or references. We cannot have vague discussions; it is impossible to contain them. If a topic is precise then it should have a defined answer. 
Regarding chat:
If users are not willing to use the chat for discussions then they perhaps are not interested at all.

4833: <p>I was wondering, why opinion based questions are not allowed ? Can't we have discussion(s) on questions ? I understand this is question-answer community but if it is not good idea then can we request new feature for discussion ? :P </p>

<p>P.S: Chat rooms are for discussion but I doubt it will get attention of many users.  </p>
 3624: <p>In addition to the answer from @WYSIWYG; the entire StackExchange network generally discourage opinion-based questions and discussions (see e.g. <a href="https://meta.stackexchange.com/questions/192461/question-of-type-what-is-the-best-why-not-where-to-go?lq=1">this </a> and <a href="https://meta.stackexchange.com/questions/167516/how-can-i-encourage-stack-overflow-to-rein-in-the-subjective-vigilantes/200144#200144">this</a> post at meta.stackexchange.com). StackExchange sites are not discussion forums but places to ask and answer specific questions. If you want to have open-ended discussions you should choose another platform, or use the chat feature.</p>

<p>On the other hand, discussions about the policies and features of BiologySE or other StackExchange sites <strong>are</strong> allowed at their respective meta sites.</p>
 3340: <p>Opinion based posts are those that cannot be rationalized with either logic or references. We cannot have vague discussions; it is impossible to contain them. If a topic is precise then it should have a defined answer. </p>

<p>Regarding chat:
<br>If users are not willing to use the chat for discussions then they perhaps are not interested at all.</p>
