Re: No more gems or coins drop from zombies
PvZ (1 and 2) have been excellent games.
Since they are provided as free to gamers, the programmers (and their bosses) will need money to get themselves fed, keeping the business running, they are just human like you and I after all.
In App purchase is one way of generating revenue for the business and getting gamer to watch adverts is another, so the restriction on gem drops is understandable.
In addition to the adverts, there are daily challenge which will provide 10 further gems once you have completed the quest.
I am not quite follow that some people want to finish the game quickly, just like enjoying a glass of good wine, I personally would prefer it to last.
(For PvZ2, I would like it with more new quests and new problem to solve on how to complete the levels off course)