The problem with EMPs is not just on how available they are, is how they work as a whole

Wanna know why not many people are currently playing the Singularity? Just compare what you have to do to make his power work vs how to counter it. Let's see the challenges and limitations of each one.

The Singularity's power:

1. It requires a setup in a similar way to Trapper and Hag.
2. It requires THREE different command keys to control (power button, ability button, interaction button. Notice his power is the only one that does NOT tell you which buttons to press on its in-game description, probably because it would be to long and complicated to explain) plus a precise aim and a mechanic that requires you to center targets at your screen for a brief time. That's the clunkiest a killer's power has ever felt.
3. It requires line of sight and a brief moment to charge. It can also only target one survivor at a time. Additionally, it has a cooldown that prevents you from infecting two survivors in a row.
4. The killer stops moving completely while controlling a biopod in order to infect someone.
5. Even if you make the power work, you have to do it a second time in order to teleport and get value out of it.
6. It can teleport to a survivor without a biopod, but only if they are already infected. In other words, setting biopods is needed in order to have any power in chase.
7. Finally, even after you go through ALL that, you'll still need to chase as an m1 killer, with just a few power-ups that last for an extremely short time.

Now let's see the item gave to survivors to counter it, the EMPs:

1. They spawn on boxes around the map that generate them AUTOMATICALLY. It does not take the survivor's any time or effort beside just walking towards them (unlike what happens to Nemesis, Wesker and Pinhead's special items). They CAN speed up the process, but it's not really needed.
2. You only need to press one button twice for the effects to fully occur.
3. It doesn't require line of sight, affects a whole AREA at the same time and it has an unlimited vertical range, which means you can affect multiple floors with it.
4. You can use it while moving. Since the slowdown is small, you can even use it in chase sometimes.
5. When you activate them, as simple as that, not only they instantly remove the power's effect from all survivors in the area, they also remove the means for the killer to use its power there at all, since biopods will be disabled.
6. You can keep them for long periods of time before activating them. Because of that, you can wait for the killer to infect you and, before he can teleport, undo it and make his power unusable, which means he only wasted time infecting you. You can even get a new EMP before the biopod becomes usable again, which allows you to effectively DOUBLE the time it remains disabled.
7. Additionally, unlike sprays or syringes, EMPs can spawn an UNLIMITED number of times in a match. Also, the printing process goes on even if all survivors are already carrying EMPs.

Add to that the fact that there are four survivors against one killer and you have a power that takes a lot of effort to work against a counter that is extremely strong and easy to use, which is the recipe for a very frustrating killer. Sure, you can argue he is strong when played well, but considering how much it takes to play him well and the fact that killers who are hard to play are usually stronger than him, it should be no surprise that he isn't very popular. A killer power that needs to be used on the same survivor at least three times before it takes effect can't be called a good design.