Well, “they” certainly aren’t alone in attaching all sorts of things to the “list”, but we should be aware of the many tricks the enemy of men’s souls has in his bag that can cause the gospel one preaches to become “accursed” and of no effect. Anytime someone adds to the finished work of Christ things that they MUST do to either merit or keep salvation, then we can know that is NOT the true gospel. We are saved BY grace THROUGH faith and NOT of ourselves, lest anyone should boast.
These are technically called "works of supererogation" which are widespread in and fully promoted by certain sects of Christendom.
That is one of four clear marks of a false religion. Three others are: seeking after God, a second chance after death, and earning one's way to (Heaven)(Nirvana)(Paradise)(etc. rewards after death).