Which Experts Seem to Interchange Trumps and Points in Bridge Bidding?
Very few experts advocate, or use, the Rule of 20 as a primary guideline on bidding. Rather, it is used as a secondary measure to assist judgement on close calls, and to aid in discriminating between otherwise similar hands when making a call decision. 

The reason for this is that it is rather indiscriminate, and lacks the precision and accuracy of other methods. It fails to consider other very important aspects of hand evaluation such as:


Distribution of the rest of the hand.
The degree of 'fit' in the 3rd and 4th suite.
Point location.
Point fit; how points reinforce each other in regards to the other information available from the bidding.


In this regards it is similar to the Losing-Trick Count. an essential member of the expert's tool-kit, but only one of the techniques regularly used for hand-evaluation.