I disagree with you here but I can see where you're coming from. Sure the Mammoth has been longer without an update but as the most common and widely used by far MBT of the GDI I'm of the opinion that replacing the predator will have a far larger impact militarily than a new Mammoth would.
The problem is that the current upgraded Predator is
adequate, while the current Mammoth is not. The Mammoth hasn't even received the kind of refits the Predator has.
The reason this is an issue is that doctrinally, the Mammoth and Predator
do not do the same thing.
The Predator is a main battle tank- its task is to provide highly mobile direct fire from a platform protected against
most enemy weaponry.
The Mammoth is a superheavy breakthrough tank- its task is to provide somewhat mobile direct fire from a platform protected against
all enemy weaponry, short of strategic weapons such as nuclear warheads.
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The Predator, guarded by ablatives and point defense lasers, is protected against all tactical Nod weaponry except their heaviest plasma cannon. This is protection sufficient to carry out its mission. Its mobility remains unchanged and therefore adequate for the foreseeable future. And its armament is solid, in that it can disable anything short of Nod superheavy vehicles, and threaten even those. With the addition of the railgun munitions upgrades, the Predator's armament will become even more effective.
The Predator (with upgrades) is still a valid first-line main battle tank, and its obsolescence is unlikely to become a major problem until the very late 2060s, even if high-end Nod MBTs can match or outperform it in the mid-2060s.
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The Mammoth's mobility remains adequate for its limited requirements. Its armament, like that of the Predator's, seems to be mostly adequate and will soon be receiving an effective upgrade.
But protection?
The Mammoth, lacking defensive lasers, is critically vulnerable to well prepared Nod defenders. It has received no defensive upgrades except its ablative tiles, and yet it is the unit that as per doctrine requires defensive upgrades
most, more so than the Predator. The Mammoth cannot be considered properly suited for its doctrinal role until and unless it is equipped with point defense lasers and adequate shielding.
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The reason the Mammoth needs an upgrade more than the Predator needs to be replaced with the Paladin is not because "it's been longer."
It's because on the one hand, the Predator shows every sign of remaining capable of performing within its doctrinal role- that is, of being able to
do the job without being truly prevented from doing so by Nod weapons. MBTs have always not been invulnerable, and have always been susceptible to kills from the enemy's heaviest weapons. That's not the point; the point is that the combination of mobility, firepower, defenses, and numbers enables them to engage effectively under any circumstances and inflict harm on the enemy, while remaining mobile enough to act as a mobile reserve or exploitation force.
And on the other hand, the Mammoth shows signs of
NOT remaining capable of performing within its doctrinal role, as Nod missiles likely continue to improve (their bipropellants have obvious application to missile warheads), and their direct fire weapons advance by leaps and bounds (Mammoths are prime targets for any plasma cannon that happen to be on the field on a given day).
A weapon system, or even an entire branch of the military, that is in danger of being unable to perform its core mission needs to be replaced or upgraded. If the danger is largely hypothetical, this reduces the priority. If the danger has already materialized, the replacement/upgrade must take place immediately.
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Furthermore, it is likely that replacing or upgrading the niche Mammoth breakthrough tanks will be a considerably simpler project than doing the same with the far more numerous Predator MBTs. This is important given that we have many other immediate demands, both to secure GDI territory against Nod strategic weapons (an imminent threat) and to prepare for Karachi (our military's likely next major planned objective)