This makes it harder to recover since a collision will almost certainly destroy both transmissions. Also, without a dominant bit state it isn't as easy to guarantee that two transmitters at each side of a very long cable will always be able to destroy the local reception for each other. The cable resistance may not represent enough load to give a destroyed bit at all points in the cable.
... that the above does not matter.
if you do not detect a collision you have a good record, it is up to your code to 'know' if a record got ignored because of the former.

Erik

PS I would never attempt multimaster