It's important!!!! Because if you had a 6-letter word 'phobia' next to the triple word score and managed to get accepted 'xeno' as well... Errrr. Don't know.
Normally I would be able to tabulate the score in Scrabble (and 'xenophobia' two-ways, btw, is quite a stimulating concept in Scrabble), but I've just noticed my friend has bought yet another bottle of wine.