Chainsaw attachments, as well as Chainsaws that are basically built like circular saws with the typical base etc. and an electric motor, are common tools from companies that make tools for timber framers, and other carpenters that have to cut and joint larger thick wood and timber.
The circular saw type chainsaws are also used for cutting large amounts of certain types of insulation, such as large stacks that need to be the same size.
If CLT(Cross Laminated Timber construction) becomes more common in North America, chainsaws and circular saw chainsaws will become more common for precision carpentry, to deal with the thick lumber.
There’s only so large you can make a circular saw befor safety and weight issues come up.
Festool and Mafell already manufacture chainsaw type circular saws.