Seeker is fairly easy to counter, all things considered. It shows you the lock on symbol when an enemy Seeker has their sights on you. The same symbol turns red when the Seeker begins its teleport, giving you exactly one second of time to prepare and react. Once the Seeker has teleported to you, you have 5 seconds (Seeker has a 7 second duration, but it takes 1 second to teleport to target and another to teleport back, thus giving you a 5 second window) to engage with/kill it; which most weapons can do. Once the lock on icon turns red, the Seeker will not be able to change its positioning until it has teleported; meaning you can actually move/face backwards and have it spawn in front of you. It no longer gets the bonus back damage on you, greatly reducing the threat. As for the 4 second cooldown, well, it's 4 seconds only because of a 50% cooldown modifier; Seeker normally takes 8 seconds to recharge the ability.
Sure, if you're using something fragile, like Panther, a Seeker teleporting to you is a death sentence. However, for most other mechs, you have an alternative.
Aegis: stand with your back to the edge of the Dome shield, and the seeker will teleport outside the dome. As long as you bodyblock the seeker from entering the dome, you'll be fine.
Killshot: Just dash away
Redeemer: Just redeem backtrack away
Panther: similar tactic as the Aegis; use the stasis barrier to keep the Seeker stuck on one side
Orion: Turn around, hunter mark the Seeker and blast away. That shield won't do much.
Sentinel, Brickhouse: Who even uses these?
Surge: Dash cancel the moment the seeker teleports to you. Use the dash and immediately cancel it by opening the settings menu by pressing the Esc. key on PC, or tapping on the top left button on phone. Congratulations, the Seeker is now stunned and you can kill it.
Redox, Gatecrasher, Onyx, Hemlock, Solis: Use the 1 second prep time to reposition and then damage/immobilize it with the ability.
Bastion: Hard counter to Seekers; keep blast shield ready and use it when the Seeker teleports to you
Vortex: Use ability and melt Seeker away while taking 50% less damage
Eclipse: just don't appear on the radar, and the Seeker can't do anything.
Nomad: You have the choice to either dash away like Killshot, or dash into the Seeker to take out the shield, get 60% damage reduction, and then murder it in cold blood.
Point is- there's plenty of ways to counter Seeker. I'm aware that not all of the strategies I listed above can be used at all times, but unless you're facing an actually smart Seeker player that keep tracks of you and teleports to you only when you're on cooldown, you have a fighting chance. Of course, it won't work as well if you're in the middle of another fight; but in a team based game like this, you should be fighting with/around your team anyway. The AI bots are especially effective at taking out Seekers; just play near a bot or two when you're aware of a Seeker on the field.
Also- use mods. The legendary ones cost an arm and a leg, but the ML perimeter mod is fairly cheap and can give your best mechs slightly better survivability.
I mostly agree with this, but i've witnessed it multiple times how with the right weapon on these mechs, these tactics won't matter for most mechs, for example if the seek has a storm/missle rack, or even cryo launchers.
Alongside that i've had it plenty of times that because of game issuess the mech appears slightly faster than it should (you know, because of reaction delay between machines), it also doesn't help if your singled out.
And with mods the seeker can survive even longer before you can kill it properly. again i agree mostly with what you said, with the right tactics and/or mech knowledge you can take down a seeker properly, but usually before that time it tends to be too late i've noticed...this is not a problem everyone will have, but it is common enough that ever time seeker can/will become the next meta with much higher ranking players/acoin users just like with disc launchers....right now it doesn't seem like a problem, but you gotta remember that even if there is a proper counter, it doesn't mean it should not be nerfed, again we should take disc launcher as an example as with the right tactics that could also not over powered.