Ignite kinda sucks? Or is it just explosive concoction?

Feels like the chance to ignite is too difficult to pull off consistently. Wildfire requiring 1.5 seconds of proximity is kinda lousy because monsters just move away before it can proc. The ignite explode gem is comically bad because, similarly the cast time on the explosion is so long that everything moves away. Ignite only doing 20% of the hit per second seems really low.

Maybe this is just a problem with explosive concoction which I'm trying to use. But "100% more chance to ignite" feels imperceptible. I've taken as much ele/fire/generic damage as I can find on the tree and my ignites are rare on bosses and don't really seem to do very much. I've managed to sustain my flask charges but ultimately it's to use a skill that is significantly less good than using my bow. Even after the buffs I'm not sure I understand why this skill has more chance to ignite. Is it really just here to apply fire exposure?

Ignite right now seems like it's just meant to be a form of extra damage for fire builds, not a damage source to revolve your whole build around. As you said it only deal 20% the damage of the hit whereas in Poe1 it deals 90%, this speaks clearly that it's not meant to have numbers like a regular skill.

The only skill that seems to be naturally meant to deal damage with ignite is Incinerate as applies an ignite that's like 4x stronger than an usual skill, giving it similar numbers to normal skills, and it always ignites.

Explosive concoction is better than most skills for applying ignite, but still not good enough to make ignite its full damage source, this seems to be the design of the skill, the 100% more magnitude only brings it to like 40% of a normal skill, it's not quite on the level of Incinerate which is the only real ignite skill and Explosive concoction still has to go through the awful ailments threshold mechanic to apply its ignite unlike Incinerate. With the baseline 100% more chance to ignite it's still not near enough.

I think Concoction is meant to be a hybrid hit/ignite skill.