Huh? You think every game is a console game? That every releases, the plot is already finished? Even console games takes much years to release even if they have a BIG studio/company.
Its like saying dont release anime episodes until they completed animating all the LN content
Hate to break it to you, but this way of operating where partial updates are released periodically with small payments for access everytime is kind of the standard modus operandi on itch.io, lmao