Exactly. One would pick some nice words, one could pick the words alphabetically, one may not know / care that those words can exist multiple times in a seed...

If somebody has issues with the seed generated by his wallet (works he doesn't know nor want for some reason), a better way is to simply generate 1-2 more wallets until the words are good enough. The result is that the seed is still much better than the one the user would have been picking by himself word by word.