I think you're not getting it. You've made quite a few mistakes let's go over them shall we?
Volti alone sure not a problem at 5k, against another legendary mech or a tank.
Thunderstorm at 5k against a legendary mech is a lot different from being at 5k against other rarities to begin with so there's your first mistake. Drops the required abilities to 2 rather than 3 and worse against no canopy mods. That's your 1st mistake.
You can add tons of enhancing abilities on your implants that's your 2nd mistake.
Volti doesn't always have to use its ability against targets with full HP that's your 3rd mistake.
100k health is a lot even for a legendary mech at 5k sp, that level of health is reserved for tanks and higher HP attackers and support 4th mistake.
SP dropper voltis exist at 5k as well 5th mistake.
Getting killed faster in action than by volti's ability does not automatically mean that volti is only dangerous to campers. AND it's also dangerous to anyone reloading or with their ability on cooldown. Mistakes 6, 7.
SP dropping is a problem, yeah. But some mechs and weapons are a lot worse to fight against when an SP dropper is using them compared to other mechs. Mistake #8
Even if volti needs about 30 seconds to kill me, I still have to worry about reaching it within that 30 seconds or I'm dead. And wandering into enemy zone to kill it is almost guaranteed to leave me dead if I'm not dead before I get there which happens more often than not. I can't use camper weapons against it even if I wanted too because it just stays constantly hidden behind a wall. #9
There's tons of annoying equipment in the game I'll give you that. But there's a difference between a mech being annoying to play against and straight up not fun. Volti simply creates too much pressure to eliminate it while simultaneously being extremely difficult to eliminate because of its ability WHICH CAN DAMAGE YOU THROUGH WALLS FROM 90+ METERS AT NO RISK TO ITSELF, AN ABILITY WHICH HAS NOTHING ELSE QUITE LIKE IT IN GAME! Mistake #10
I actually advocated to NERF seeker too. #11
It's not just volti, i's not just SP dropping. It's volti at low levels and its SP dropping and its the combination of those 2 things. Volti's ability is uniquely suited to 0 skill 0 risk camping while SP dropping. If you're talking risk/ reward factor volti is all reward and no risk. It's actually stupid.