Is it a free game? Nobody is paying him to make it? That Patreon is decoration then, hm? Get real.
It's not ungrateful to question whether the game will be done within a decade - not when it's already been four years and development is continuously slowing down.
If you enjoy being blueballed for years, that's a weird fetish, but totally fine. You do you. However, it is just as fine to say that at some point, enough is enough. Learn to handle differing opinions, snowflake.