That's quite an exaggeration.
Why buy a ballast box? Then, take the B/H off and install the ballast box, find a place to store the B/H, for the winter, take the ballast box off, find a place to store that, and put the B/H back on in the spring? Especially, when you already have the B/H, and it's sitting on the back of the tractor?
That's probably true in some cases. GC's are "estate" tractors. They were designed for property maintenance. This is exactly what they had in mind. Not sure why it doesn't make sense to use it, if you own it? That helps justify the $15,000+ investment in it.
Again, buying something, maintaining it, and storing it, when you already own a tool that can do the job? To each his own.
With the backhoe off I can fit the tractor in my 2 car garage with 2 cars. Backhoe on TLB unit takes just about takes an entire bay itself.
Added ballest box, more traction on rear. Can make turns without bashing the backhoe it the house, truck etc, hard to look back when your all dressed out.
OP started thread with just buying a TL, and was worried about plowing a long road. Plow truck would be the best tool and cost 1/4 of the price of a new 1705 / plow or 1705 / blower