Operating this at scale will be a problem. Yes, you can make one this big, but how durable is it when you build one at industrial scale? If you need a million little tiny fingers working for days at a time, what's the mean time to failure and how hard are they to replace?
Right, but how long will it last before it breaks? If it can only do an acre of crops before part of the mechanism breaks it won't get adopted by farmers.
I meant to convey that the machine isn't going to fail after one acre or any other small amount. It won't be built out of legos ;)
And shouldn't the end-game be to eliminate the need for human labor for these grueling jobs? Even if the first iteration isn't quite as good, it is important to look to the future.