I understand,some things can seem "commandy".
There is a place where Paul talks about buffeting his body,and such,which one could easily read something into that.
What I do,is read the bible through the eyes of grace,and know that the writers,maybe did not realize their wordage,or the way it might be perceived.
Paul seems to have caught himself midway here,,he said I,..but then,said though...
1 Cor 15:10 But by the grace of God I am what I am, and his grace toward me was not in vain. On the contrary, I worked harder than any of them,
though it was not I, but the grace of God that is with me.
I think part of the inspired text,can also show we are all human,and it is ingrained to look at us,rather than him,as we see ,that could be what happened with your said verses.
Or maybe they took for granted,it was by grace?
I suppose also,sometimes there can be straight talk,to some people who were in the condition of the rev churhes.Imho.