Simple Answer: To prolong the story. He said in the past article, which is playing out right now.
L&P Patreon Quote Sept. 24, 2020:
"The only really productive and effective solution would be an office where we could work in the way all video game companies are working. Nobody’s working over the Internet as long as they want their product to look like something. This way we could talk and develop simultaneously and could have an eye on everything. The huge disadvantage would be giving up anonymity and paying much more taxes. And of course, if you’re throwing your free time away and work practically 24/7 on the updates, you also want that it pays off. After all, I need to save money for an own apartment and my pension later.
At the end, I think that it’s better to create a great game in 10 years which people will remember than an average game in 1 year nobody cares about afterwards.
Many people also don’t understand how exhausting it can be to work alone on such a game with that quality and extent!"