I've been having quite some fun and success with a pure bomber squad in the past but that was before the latest stuff came out. The reason my bombers worked was that I had weapons on board like Seismic Charges and Assault Missiles which are great against formations and especially swarms. I was able to dish out enough damage with the Secondary weapons to make up for the poor primary attack of the bombers. I'd say my squad was based on a meta were one had to expect swarms and mini-swarms on the Imperial side and lists of 4 ships on the Rebel side.
What I'm asking myself now is - did the meta change with wave 4? I think there will be less Tie swarms now and also quite a few Imperial lists including Phantoms and consisting of only 3 ships. On the Rebel side there might be swarms now but I also expect to encounter Falcon lists with 3PO on board and 2 additional ships. I think I'll have to go up against less formations and more lists where the ships are flying more spread out which will be hard to handle for my bombers.
I've thought about tweaking my squad by replacing Assault Missiles with Flechette Torpedos and Ion Pulse Missiles but that would mean a lot less firepower in the alpha-strike and the bombers will be too weak in attack afterwards with only their primary weapons.
What do you think or what was your impression lately - did the meta change? Are pure bomber squads still viable?