On Thu, 3 Jan 2019 07:13:12 -0600, dpb wrote:

On 1/2/2019 11:04 PM, wrote:
...

You are adding "plug on" connections in addition to a lug. If the
connectors are good it is OK I suppose but every time you add a
connection you add a potential failure.

Same number/type of connections; just in different location...instead of
one on the breaker it's on the panel buss bar; the conventional breaker
still "plugs in"

It depends on the breaker but on most there is only one "plug in"
connection and the rest are terminals or lugs. (The load side circuit
and the neutral on a GFCI/AFCI)
Here you have 2 or 3 plug in connections plus the terminal for the
load side connection.
On commercial panels (QOM) the line side connection is a screw
terminal too, no plug in at all.