I can definitely understand they want to take their time and make the best game possible. I've no doubt they will. Though I will concede there seems to be an optimal 'hype window' with releases.
Hype builds, people eagerly await the game, but if people wait too long and start to get frustrated, eventually the hype dissipates. For me personally, Dreams on PS4 is just taking so long that I've gone from checking every day for beta/release news, to shrugging and saying 'eh if it comes out I'll come back later'. And from browsing comments, a lot of others feel the same way. While I love Media Molecule's passion and wanting to add even more to the game for release, they brought it on themselves by giving too many dates and missing them. We've gone from 'beta in 2016', to 'release in 2018', to 'beta in 2018', to nearing the end of the year and no word of beta or release. And it gets tiresome - you get your hopes up, and you get let down time and again.
Some might see this as gamers feeling entitled. There definitely are some who feel they are owed something by developers, aside from the 'pay money for game' contract. But through reading articles, watching trailers and gameplay, and generally anticipating a game, people honestly invest quite a lot of time and energy into these things.
It wouldn't be so bad if it weren't for other games taking people's attention away from their product. Gone are the days where I buy multiple titles and stack them up to play one after the other. I'm more inclined to just buy a different game first, play that, then catch up with other releases after the fact - and probably preowned then to save some money. I'll be buying Spider-man as soon as I can, and Tomb Raider, even RDR2 can wait til I'm done with Spidey.
Similarly, SS has gone from 2017 release, to 2018 release, to presumed 2019 release. In its favour, I guess news regarding SS has been so slim that they've not built up much hype outside the die-hard fan community. So closer to release when publicity increases, I don't expect OWI will have a problem. The only concern is whether they'll be releasing right at the end of the current console cycle now, and whether that itself could impact success.