I do sympathize with the concern about it taking a long time to read through all of the things, which is why I do try to make the effects largely intuitive, or at least apparent with in-battle text.
...Note to self, consider pokegear app detailing fields.
I'm not going to make fields arbitrarily, but I do feel strongly about continuing to add necessary environmental and thematic ones. I currently have about ~12 more planned in total, 6 of which should be added in E15, and 6 of which will come with E16. That should pretty much take us through the rest of the game, so after that, I'll likely chill out with them.
My focus is on the end product. I acknowledge things changing in earlier episodes is jarring, but I also think being able to, as Tacos said, refine, is necessary, and is a large part of what has gotten the project to the state it's in currently.
As an aside, although this is a discussion topic, it's not necessarily the best place for suggestions. There's plenty of other places for that...
As any one who checks the status thread regularly can probably tell, we're getting close for 14.5