This only applies to haze bombs basically all the other bombs aren't that annoying. And if you find them to be them to be then you're bad in lockdown.

say walking in as striker

If you rush into enemy territory as a lone striker then yes, you might end up trapped and killed. Fortunately, Lockdown is a team game and if you do teamwork with your team if is unlikely that a lone hazebomber could kill you or even stall you.

Also why spend 5 minutes gunning the bomber down when u could take them down in 10 seconds.

And why should the bomber die in 10 seconds when they can hold a capture point for 5 minutes? If you and your team can't get through a bomber in less then 5 minutes then I don't know what to tell you. As a regular hazebomber I can tell you that a single gunslinger who knows what they're doing will get me in 10 seconds or less, and two people working together will get me instantly if I don't have support.

with basically no counter
- Guns, any guns
- Bombs
- Teamwork
- Helping your team with another capture point since if you're alone against the hazebomber the rest of your team is struggling elsewhere
- Being a guardian
- Being a recon
- Fire pots
- Armours
- UVs

So yes, apart from the vast majority of the game's arsenal, playing a teamgame as a team, or being skilled there is basically no counter. It's not like haze bombs are the most counterable weapon there is since there are many ways to be 100% immune to multiple of them.

Pfft... It's all 'bout that sweet sweet double-digit ping bruh. If you have it, it doesn't matter how bad you are, you're always gonna have an easy time. I've seen people who got no idea what they were doing, just standing and spamming combos at random directions and still get 10-20k damage. On the gunners' screens they usually hit her, but on her screen the shot actually lands 4 tiles away and she doesn't get hit. I used to be a PvP bomber, with 2 bars I was only able to deal with 1 or 2 gunners at a time, gave them a hard time, but in reality all I do is moving in random directions cause I got no idea where they're gonna hit or according to my ping where they already had hit. As you said though, blitz needle completely destroys bombers, try using it, bombers usually don't have piercing defense, grim repeater works too, fire and shock weapons are a good counter as well since they interrupt their bombing-chains, you can place a single "light" bomb like nitronome, DBB, DR, shards, etc... But the haze bombs got more charge time to be able to do that. Fire works best against bombers if used by a haze bomb, pro bombers learn the timing of fire so that they can continue bomb-spamming at the normal pace. However, one of my favorite ways to deal with a bomber is to use DR since bombers are usually charging their bomb, they take a ton of damage upon stepping in one of those. Shard bombs work as well.