Well, phungus, I don't agree it is leaving its current niche. As I said earlier, content additions will probably be few and far between and I would give them due consideration if they fill a really bad gap or could really improve balance.
LoR is an unofficial expansion and even if PIG added a single new unit you'd agree the scope of LoR is still far beyond PIG's. Most other modpacks end up adding new units, techs, civics etc., often on the order of hundreds. This is what I call intimidating to people who are looking for a simple or very focused mod. If PIG introduces a single unit, the sky's not going to fall in. A single steam powered unit should probably have a negligible effect on gameplay compared to what mods like RoM and WolfRevolution would do.
That's not bad in it's own right; but my question is if PIG is to join the list of other expansion style mods, what would it offer that the others currently available do not?
Considered additions.
As I have said, PIG does not believe that variety is always a good thing. Most other modpacks (especially RoM) do essentially believe variety is a good thing. Any new wonder or tech that's interesting will be added. Never mind the impact on the game.
I think you're being highly pedantic to say PIG is going to exit its current niche by adding a new unit. I haven't even committed to the unit yet anyway. I'm still waiting for a more detailed description of what the unit would be. So I think it's jumping the gun to be worrying about the future direction of this mod just yet. Make no mistake, the goals and directions of PIG are still the same as in the document I posted in the OP.
The one sentence I guess, in the document, that isn't really 100% accurate is when I say "It works with what already exists in the game". This is something I'm going to try to stick to mostly, but obviously I haven't followed that religiously because I've included event images and SDK changes that are changing the gameplay (is a logic improvement (e.g. one in BBAI) to be considered an addition?).
The point of being careful about changes is not to be restrictive just for the heck of it. Take Better AI - at some point the decision was made to start adopting UP additions and other very small gameplay additions. Has that drawn people away from the mod? I remember some people were very vocal (I'm thinking of Woden) about keeping gameplay changes out of BBAI.