All burners can write lead-in and lead-out.
The reviews report whether drives can read from lead-in/lead-out on Audio CDs. Due to the fact that most drives read the audio on Audio CDs with a certain offset, it becomes important to read from either lead-in or lead-out depending on what that offset is, if you want a 100% perfect copy of a track.
If you rip an audio track by compensating for the offset and without the capability to read from either lead-in or lead-out, the ripped track might contain samples that are incorrectly set to zero.
Since the offset is usually tens or hundreds of samples out of 44,100 samples a second, this is not really audible to the ear but audio purists prefer to have it 100% bit-for-bit perfect.
There is no offset to correct for Data CDs or DVDs and hence no need to read from lead-in/lead-out.