1) Every day I see a lot of people flying light and medium bombers. Not less than other classes of ships.
2) Bombers must be weaker than fighters in terms of balance or we will get redundant class. Why even bother piloting VHF if you have bomber with cool toy called SNAC, good against everything?
3) Instakilling small fighter with big capital ship is okay. Compare their sizes. Caps are powerful and slow, snubs are fragile and agile.
It should be so.
To accurately say why the activity falls, you need to investigate. Connecting two random events does not require a great mind.
Having an instakill weapon in game is okay as long as it has sensible drawbacks. And speed is not enough. You just need to box your opponent one time to kill instantly. If your opponents are not bombers with SNAC, bad to them. SNAC-boxing is cancer.