That is not what I wrote in the ConfigureDefender help:
I recommend disabling CFA when users want to avoid exclusions and false positive alerts (which is true for most users). Anyway, ConfigureDefender HIGH settings include some anti-ransomware prevention by increasing the Cloud Protection Level and applying ASR rules.
I cannot recommend OSA for the same reasons as for CFA.
Of course, if one can accept false positives, then CFA or OSA can be used. However, OSA is not software for everyone (similarly to H_C) and might require special configuration to help prevent ransomware.
Edit.
I moved your post from the H_C thread to the ConfigureDefender thread because you do not use H_C.