I believe they also said they don't want to do more of the same, they only want to work on something new. Hence why the only new Half-Life anything in 20 years is Alyx - it did something genuinely new.
We all want HL3, but other than the story it would probably be fairly stagnant in terms of gameplay - nothing new has really happened in the genre.
We all want HL3, but other than the story it would probably be fairly stagnant in terms of gameplay - nothing new has really happened in the genre.