The old way is to do that to ensure it’s long enough to cross chain, nowadays this need to be avoided especially on the smallest sprocket where the derailleur may not have enough tension to stop the chain from skipping on the 11/10t cog.
I think it's more due to people replacing chains and chucking the full length in. I get a lot of those, people with front derailleurs that rarely use the small ring anyways
The old way is to do that to ensure it’s long enough to cross chain, nowadays this need to be avoided especially on the smallest sprocket where the derailleur may not have enough tension to stop the chain from skipping on the 11/10t cog.