As i said in the post you quoted, i already did that and it sorta fixed it. I am fully aware of late to later game mob farming mechanics, i just don't have the infrastructure yet to support such mob farming methods and even if i did it wouldn't change my mind about lighting up chunks and chunks of area. This has nothing to do with me farming the seeds, this is entirely about mobs randomly dropping them (when not killed by the player) as they wander around causing entire fields to become infested by them even with full grown effects disabled. I have watched enough of Dire's videos to know how to grow them automatically if i wanted to, this isn't about farming the seeds.
I find it extremely hard to believe that the seeds completely taking over EVERY SINGLE grass block as far as the eye can see is intentional and by design whether you have final stage effect on or not. At the very least i will be happy if someone could tell me how to disable mobs randomly dropping seeds unless physically killed by me.
I don't think you or anyone else trying to come up with workarounds fully understand what this is about. I appreciate you guys trying to help but these workaround are not what i am after here, i am after a way to stop mobs from passively dropping their seeds (without the player killing them directly) that end up taking over huge fields even with the config option for full grown effects disabled. I will repeat this again, i am not trying to farm the seeds, i am not going to light up chunks worth of field, i am not going to place blocks the seeds can't grow on, i am not going to stop mobs from spawning around the outside of my base. Disabling full grown effects was a good tip and helped with the issue, but until i can stop mobs from dropping their seeds without me physically killing them, this will continue to be a problem and no amount of block placing or changing how i play will change that.