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However closing down defintions and narrowing them to a set frame makes a conversation/discussion move forward more efficiently
Loose definitions can result in irrelevant fights over semantics.
Disparate understandings of a words definition leads to incomplete or inaccurate transfer of ideas between participants in a conversation.
what is your definition of "loose/open"
loose definitions increase the risk of semantic shifts.
Everyone intreprets concepts and keywords very differently and staying open to others interpretations/perspective makes finding a reasonable conclusion easier.
But having loose definitions creates unnecessary arguments and does not allow for further discussion on proper matters.
The desire to explicitly define every single term before a discussion even begins is typically a bad-faith attempt at pre-emptive derailment by trolls. Only in rare cases do we need to define things in order to discuss them. Nothing is learned when discussions converge to arguments over semantics.
getting caught up in semantics detracts from the actual argument at hand.
Common usage should always take precedence over ideologically hijacked terminology. Concrete over abstract should also be a primary goal. And most importantly, Kant is a tedious old windbag.