I agree with that interpretation. Yoshi very specifically did not comment on what players should or should not do.
As for the last part, I find that the debate is just as often instigated by the "healer is a delicate flower/special snowflake" end of the spectrum as it is by the "healers must DPS, or they are bad" contingent. While I stand solidly in the camp of "really good healers also know how and when to DPS," I wouldn't go so far as to declare non-DPSing healers bad. They are just...not playing as well as they could be.
