Not to belabor this debate further, but I do understand the idea behind having passives decay. The idea was to force people deeper into the Mana generation chain, rather than mass produce a metric shitton of passives. I'm not saying I think this was the right solution, but I understand why it got nerfed.
My biggest gripe about the passive decay is my personal playstyle. I'm usually all over the place as I get things set up, with a thousand projects going on at the same time. Occasionally (read: constantly), I get sidetracked away for a while, only to come back an hour, a day, or even a week later to dive back in. With passive decay, I find myself making flowers, placing them down, getting distracted, returning to find no flowers, rinse and repeat. If the timer only ticked while producing, it might help, but I doubt it would be much better unless the timer did regen when they were not producing.