Secure and Shatter are in this weird situation where the former was temporarily removed to add a few new things to become slightly more interesting and thus bearable, while the latter was given the opposite treatment and actually removed capturable bases and has become worse with focus constantly being taken away from actual PvP with respawning large ices that now are almost never contested by more than one team save for the mid.
Secure still suffers from the tendency for teams to "see-saw" around the map in a murderball, and is the most punishing map to get double-teamed on now that there are more bases for enemy teams to hold while they both converge on either side of your spawn, preventing you from leaving or holding more than 1 flag. I've said before, but I have never seen wilder swings in scores on any other Frontline mode because of this ability to safely double-team the leading team without accidently engaging the other pincering team. I'd go so far to say early leads in Secure are meaningless if not downright suicidal. It often seems like the last 300 points are the only ones that matter.
I'll take new Secure over new Shatter, however. The devs are hell-bent on keeping Shatter a near-endless training dummy simulator with constant respawning ice. They removed small ice's original behavior of respawning like every half-minute to always having 2 large ices active; worse being if you're the only team that doesn't have an active large ice, because in all likelyhood your large ice is now stuck spawning alongside the middle ice which handicaps your point accumulation. That and the first team stupid enough to push into another team's large ice bottleneck is wide open to getting pinched by the 3rd team barring rare, desperate circumstances where they actually circle all the way around to pinch a team at their own large ice.
I wonder if the mode could be made even slightly more interesting if it tried copying new Secure's mechanic of awarding some Battle High for destroying NPCs (ice) so the people stuck slapping ice dummies all match aren't totally useless in fights from focusing on the literal one objective of the map that exists to constantly dissuade people from actually PvP'ing. Large ice gives the team that contributed the most damage to it 10 Battle High (provided you actually hit it), with smalls giving maybe 5.
They won't outright remove both modes though (even though I'm largely indifferent to Secure and outright dislike Shatter). What with achievements tied to them, and how bad it would look for them to pull their two "reworked" modes. Just don't play on the days with the maps you don't like. At least the rotation is so they aren't back-to-back days.