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When you increase the quality of a game series with each new installment, you have to continue meeting the new standard with the game after the next.
If GF made a pokemon game with a high budget to increase visuals, performance, content, etc., they have just created a new standard for themselves to meet for the next game.
Given how they have been releasing a new game every 1-2 years, that budget would become very difficult for a small company to achieve without cutting corners or adding HUGE delays to development time.
Compain about how lazy or greedy GFis because they dont go above and beyond, but one of the reasons GF holds back on making pokemon a sprawling, huge, beautiful world in every game is the matter of long term budgeting investment on their part. It'd be very difficult to pump out a game every year with a high budgeting, given the team's size and time constraints they already have problems managing as is.
