Quite, and although we tend to think of it as 'good/standard practice', even the logic of that is somewhat questionable. The primary purpose of MPB/PEB is to minimise potential differences between exposed-conductive parts and extraneous-conductive parts (or things joined to them). In most installations, there will be at least 5 - 7 (depending on whether or not there is a NET external to the CU) 'screwed connections' (connection of a conductor to a terminal/block/bar) in the path between the extraneous-c-ps (at the point of bonding) and any exposed-conductive part, so an additional joint (of whatever nature) in the MPB conductor does not make much difference to the big picture (provided it is 'accessible' for inspection).
One can't argue with that, but people (and organisations!) are seemingly inconsistent. Those who believe that joints in an MPB conductor are 'not permitted' do not (at least, usually!) also believe that JBs in final circuits are not permitetd, even though they involve joints in exactly the same electrical path that is relevant in terms of an important function of the MPB.
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