How does conquest work
It just seems like each team has 550 lives and the winner is the team that survives.
How does it work with the flag captures?
If I remember correctly(Haven’t touched BF in 10 years or so), if you have more flags than your opponent then they lose ticks over time, not just when they take casualties.
So instead of turtling in a corner and mowing down waves of attackers it forces you to move out, attack, take various points and objectives in order to prevent them from taking all the points and just dropping your ticks with flags.
Thanks for info 
Is it just me or does it seem that there is no one playing rush these days?
That is basically the gist of the mode.
Each side has a set amount of “tickets” that each respawning player takes one off of. The side that has the least amount of flags under its control bleeds more tickets over time compared to their opposition.