Ignite is suppose to secure kills not get you kills
Now there is a clear difference, ignite before it's buff used to help you secure kills, it would apply grevious wounds to lower healing and do a little bit of extra damage to almost ensure you get that kill you are going for, you, your champion and your items would do most of the work and they would dictate whether you could kill the opponent and ignite would be there just as an almost safety net to help ensure the kill. And in majority of cases, ignite wouldn't allow someone to kill someone else who otherwise would not be able too.
Now after it's buff, ignite is dealing a good load of the damage towards your kill. And is being used to get you a kill instead of ensuring one. This is extreemely prevelant in supports aswell, who now have the damage to burst adcs early in the game (my duo plays soraka and I see him do it all the time) from a decent amount of health. Ultimately using it to get a kill rather than secure a kill that perhaps their adc couldn't get.
Imo ignite should be reverted to it's previous iteration as it had a niche in that state that wasnt just more damage.
Edit:
Tldr: if you can't kill me without ignite , in most cases you shouldn't be able to kill me with it.