Not 100 percent sure, but I think Respawn is also rolling out Challenges as well.
And with you, man. I'm Gen2.18 and still liking it and discovering new things. I haven't touched BF1 that much and I'm a big BF fan. Everything is so tight, polished and the kits are balanced enough that I don't see any one thing dominate. I see a lot of people use Cloak, Stim, Hook, etc. and same with the weapons. Alternator, R201, Hemlock, etc. That's a mark of a well balanced game where you don't see the same weapons and kits in every person playing.
I think Vince Zampella tweeted that Frontier Defense won't be available "at launch" which means there's a good chance that it will be added in.
Stick with it. You get merits which you can later use to buy high-level stuff. It helps A LOT. I unlocked a few things right away using it. And yes, applies to Titans as well.
On another note, just played my first few matches on PS4 Pro and man! Looks so sexy. Everything looks cleaner, crisper and just noticeable difference. Details are more vivid too.
Also, not sure if it's the sales or people jumping back in after the elections, but I noticed the player counts are back to normal. Saw 15-16K during this time, and yesterday it was like at 12K. Nice.