In A19 you could farm and have exponential growth with 0 points invested. Now you need to have at least 1 point invested to make a profit.
No. What I said is that you will make a profit from farming as long as you have 1 level of LOTL.
The system COULD have been simplified to leaving the seeds planted as in A19 and adjusting harvest to the same amount that we get now but no one asked me. =P
Wedges have a minor advantage in that more blocks have to be destroyed for pathing to become invalid.