That would lead to a big problem: the Barbarian is a melee class, the Druid is a shapeshifter that may fill in a tank/up front function with magic assistance, and the Sorcerer is a caster class. Adding a different committed magic course, even though it were a damage-dealer, would greatly sway Diablo 4 toward magical courses. That would mean that the last course would have to be a dex-based course like the Amazon, rather than there being more of a split between the various types of classes. On top of all that, a Healer-based course would cancel any equilibrium in terms of experiences, as too weak and the encounters will be unbelievably tough or two overpowered and the experiences will not feel engaging.
As above, including a Healer-focused course would change a whole lot about Diablo's gameplay, to this point it might not even be Diablo more. In most games using a Healer, even ones capable of some harm output, they have to hang back. This is how it is for healers in World of Warcraft, Overwatch, and so a lot more games because, as any enemy obviously will, Healers will be well targeted. In Diablo's case especially, this might mean there would have to be a basic change where hanging back and recovery, while somehow dealing harm in spurts, was potential. However, the gameplay is much too fast-paced from this, and also a change of this size would upset several.
On top of that, it can be easily seen why people who prefer to heal would prefer some form of representation in Diablo 4. A whole lot of games have classes that focus on healing, but these matches tend to be compelled co-op or multiplayer matches. Because of this, a Healer course would be largely weakened in terms of solo play, as their abilities might be focused on recovery themselves and even others, but keeping up with the damage output would be tough unless the course was overpowered. This might signify the Healer course would just work for people with dedicated groups to play with, and dedicating one entire course to such a tiny market (because there oftentimes visit to be of those who DON'T wish to play heals than those that do) would only bring more than it brought up.
In the end, no one can mistake those who prefer this playstyle from needing a role at a Diablo game, and it's surely possible inside a well-defined setup for this. However, the changes that could bring to Diablo would not only observe a huge blowback in all likelihood, there could be a massive number of limitations and balancing acts for the class that it is hard to see it being worth it. A healer class for Diablo 4, at least in the most-defined terms of the class, isn't going to happen, and the same can likely be said for many future Diablo games.
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