That was an interesting idea. Deere acquired them, and built a prototype.[1] But Ponsse's approach[2] was more practical. The dual chassis articulated 8-wheel system is unusual but very effective.
A big problem with those heavy legged machines is very low road speed. The Ponsse machine is much faster when you aren't in difficult terrain, so you can get it to the job under its own power. Deere copied that and now makes those, too.
[1] https://agmetalminer.com/mmwp/wp-content/uploads/2012/04/wal...