For our existing frigate and cruiser designs, there's a strong incentive to squeeze because the one-megaton berths present a sharp constraint on ships' total size. Packing the maximum possible performance into a hull of fixed size, regardless of future refit potential, then becomes rather more tempting.
The Cardassians actually have a similar problem, arguably even more so than we do, because so many of their berths are 1.2-megaton facilities that are
just exactly the right size to fit a
Jaldun. They can't afford to 'go big' because only a fraction of their total berths are significantly larger than a
Jaldun, and even those are bigger by a limited margin. By contrast, we have a LOT of explorer berths and have ample political support for building more if we need to, which means we are much more free to contemplate 'leapfrogging' the Cardassians in tonnage and starting a class of 1.5 or 1.8-megaton cruisers as our next generation cruiser design.
...
That reminds me of the recent discussion of starting a new heavy cruiser design, along with the proposed new generalist frigate. Suppose the refits to the
Jalduns* really do give them combat performance superior to the
Renaissance as SWB predicts (he's projecting C5 S4 H5 L6 P4 D4 for the
Jaldun-bis and C7 S3 H5 L6 P3 D5 for the
Kaldar-bis). In that case, it becomes
exceptionally desirable for us to counter the
Jaldun-bis with our own heavy cruiser class that approximates the
Kaldar-bis in performance.
Personally I think he
may be overestimating the refit ships' performance, but I wouldn't want to bet the farm on it. I can see the logic- the
Jaldun remains a generalist ship but considerably uparmored to double down on the advantage of durability the
Jalduns already have relative to most Starfleet designs, while the
Kaldar becomes a "pocket battleship" that is in effect a tougher version of the
Lorgot. On the other hand, it begs the question of why the Cardassians are still building
Lorgots at all, unless they have a refit version of THAT, too.
___________
*In pursuance with Warsaw Pact naming habits, I dub this class the
Jaldun-bis.
...
On a side note, I suspect that some of the extra tonnage of the
Jalduns and
Kaldars may go into things that don't affect naval combat performance. For example, large cargo bays that enable them to transport supplies as we've seen references to them doing. Or large ground troop contingents so that they can do 'pacification' and military occupation missions more effectively.