I appreciate that the new farms may not be everyone's cup of tea, especially if you min/max and/or compare to a SC's tree farm.
However the old farms
a) were incredibly OP, especially if their design flaw, which unintentionally allowed for stacking of several layers, was abused. Endless resources at the cost of cheap energy. The only reason you'd ever switch off one of the old farms was because you couldn't be bothered to deal with the deluge of resources they swamped you with. It just wasn't fun playing with them for me. I haven't built one of these things in a long, long time. I went out of my way not to build any in my legit worlds.
b) were dead, deeply flawed code. It hadn't been touched substantially in something like six months and it showed. Everything was creaking and little things were breaking. Dirty hacks to patch things up all around. And they still cracked at some points (Arboretums going haywire with rubber trees anyone? Fixed height for all trees, making it impossible to harvest larger trees, etc.)
c) felt flimsy and cheap. I like magic blocks as much as the next guy, but after a year, a single, brightly colored, cartoonish looking block which harvests melons 5 blocks out and 5 blocks above just felt wrong, almost comical. I don't want to knock the old farms too much, I had a lot of fun playing with them for quite a while, but they used up all their novelty to the point where suspension of disbelief just wasn't there anymore. Granted, the new farms can still be said to be a gigant magic block, but I am more inclined to believe, that these large structures house all that heavy machinery necessary to harvest and plant a variety of crops. Imagine a harvesting arm extending outward and circling the central structure while it works and it doesn't even feel magic anymore. (That was actually the plan at some point, but was discarded in favour of making layer placement more flexible.)
There is more, but I already wrote way too much anyway. X)
tl;dr: I know some people like the old farms. I will try to keep them around as an option for a while, possibly even longer as a seperate module. I will not guarantee porting them forever and ever. Try the new farms before you knock them. Yes, they take space. Yes, balancing and development is in progress. The old farms were actively developed for almost a year. The new farms have been in development less than a month and under actual public scrutiny for a week. No, I will not try to compete with Steve Cart's tree farms or TC3 golems. (A multifarm doesn't stand a chance against the cuteness of a TC3 golem anyway.)