Indissolubility is clearer.  But fuller?  I love marriage as an institution.  I have been married a long time, and have children and grandchildren.  And I have a professional understanding of how the law works.  And I know from history that even for the Church indissolubility is not as indissoluble as currently assumed.  The question is not what Jesus said but how was he loving in the saying of it.  In too many concrete circumstances of lived experience application of the principle of indissolubility is inattentive to the love than Jesus is.  This is not about tough love, which has its place.  It is about the injustice that flows from taking a reasonable ideal -- and indissolubility is clearly a reasonable ideal -- and insisting that reality fit this ideal like a glove.  It works the other way around.  God's creation -- God's reality -- is much richer than can be encapsulated by reasonable ideals.  To elevate indissolubility to God's reality risks idolatry.  Love overcomes idolatry.