Yes, of course they are, as is the use of Arduino functions and a library if it comes to that, but he already has a starting point so why not build on it instead of the "if I wanted to get there I would not have started from here" which is so often the case with help provided on the forum
The primary aim should be to get something working, not to get something "better" working. The first thing that @jek58 said in the topic was
hence my simplistic suggestions to add more cards that you and I know can be improved on in a number of ways