To add to Taika's post -which is 100% true,- I will also say that telling a newbie to NOT DPS because they don't know the fight is just a form of fear-mongering that does nothing but spread misinformation. We should be encouraging new players, specially those who are interested in actually performing at an average or above average level.

Yes, your job as a healer is to heal and do mechanics, but also to contribute as much as you can to the party, which is something every one of your other party members is doing at all times. That's like telling a Ninja not to worry about keeping DoTs up or using Mudras because it's overwhelming and it distracts them from mechanics, or telling a tank that it's okay to just spam the enmity combo over and over because their job is just to tank and hold hate, and focusing on DPS just distracts them from their main function.

How much DPS a healer puts out, and if they optimize their MP use towards DPS+healing is the player's choice, yes; but contributing to the party's overall actions-per-minute is everyone's responsibility. No matter how many times you repeat that idea of combat balance not taking healer and tank DPS into account, the fact remains that healers who refuse to learn to DPS, whether by principle or anxiety, are being a liability to their party by following a mediocre playstyle by FFXIV's system and standards. This is not "toxic community meta," it's an objective analysis that is even supported by the game's Hall of the Novice and the availability of so many DPS spells in the healers' toolkits.

If, as a healer, you refuse to look for DPS opportunities, or don't create them for yourself; or even worse, refuse to DPS at all, then you have not the right to complain about DPS that don't put out decent/good damage, or about tanks not mitigating or positioning well, or about any other kind of mediocre playstyle, since you yourself are perpetrating one.