Your 1st sentence is the key..... 'for a performance application'. For a lo-po, d-driver, or cruiser use, where the rod oiling is adequate as-is, no need for full groove, and it may lead to accelerated main wear at the lower oil pressures (idling, daily driving around town). That is the reason that I said it is a trade-off, and I would encourage folks to understand why to go one way or the other.
Now here is an interesting compromise at least for 360's: 3/4 groove.... never knew that existed.
What main bearings for a high performance engine?
