Shown above are two BarSto Hi Power barrels. The bottom is an early one-piece bbl while the top is the more conventional two-piece, similar to the ones made by FN. A fine seam can be seen on the two-piece bbl. (The picture can also illustrate the difference between the "humped" feed ramp (top) vs. the "straight" or "throated" one (bottom). Classic Hi Powers normally have the humped while Hi Powers from the Mk II through current Mk III's have the straight ramp, which is much more "friendly" with JHP's.)
Some years ago, a gun magazine did a test on various 1911 barrels that ranged from GI surplus to the match barrels from some really good makers. They fired the barrels via a device that locked the barrel firmly in place. To cut to the conclusion, there was very, very little difference between any of the barrels in terms of their purely inherent accuracy. I believe this included a two-piece Springfield Armory barrel as well as some other factory barrels.
There are reports of Browning Hi Power barrels failing after a great number of shots, but I don't recall any of them separating. There very well may be some such incidents, but I'm betting that they're statistically rare. With as many Hi Powers in use around the world, if it was a real problem, it would have been addressed by now.
I don't think it matters.