I'm pretty sure supercell know that farmers gem too, albeit not as much as the top players. I agree the update ruined the fun of farming at TH9. Not there it isn't fun anymore, just not the kinda fun one would have at a maxed TH8. My advise is have fun at TH8 and max out everything, including walls. After that, if you never plan to go up the leader boards, stay at TH8 and just have fun raiding. Its actually quite nice ... you get almost all the units at TH8 (both normal and dark troops).
At TH9, Over time you get used to it, but you're basically getting used to less fun. Its gets quite depressing. Don't quit. Hang in there. You will need to get used to slowing down, playing less. Its still a pretty decent game ...the frustration is due to the fact that no one expects less fun on upgrading.

Understandeable right?
If you're very competitive, you may rage quit cos you'll hate the pace.

The reality is the mine/pumps loots had become irrelevant at TH7 when upgrades reach the millions. But then at TH7 and TH8 you can raid the needed cash. At TH9, raiding borders on the same kind irrelevancy. You have too much to upgrade and too much penalty on raids. You can never match up with other TH9 who made it there before you from a time they farmed without penalties. And after the last update, its even worse. So its either we play REEAL slow ... and throw out any level of competitive spirit we had, or we GEM. Anyone saying otherwise doesn't get it. That's ok. Everyone has their own pace and level of competitiveness in them.