We seem to be talking past one another to some extent.
It is probably my fault.
I suggested putting the City Hall at Redistribution or Mathematics.
Your replied you would "not be placing any new maintenance reduction building earlier than Redistribution." I do not think anyone suggested that.
Kiln as an improvement I do not see as worthwhile. Kiln is a useful early building as is. Getting rid of it as a building reduces commerce.
Being able to build a cottage very early, but not allowing it to grow until later, would make some sense and might address the some of the concerns.
(One could have a series of techs allow growth to hamlet, village, town, if that is doable.)
Personally, I do not see the need to change things a lot prior to Redistribution.
I do not share "Keinpferd is concerned with a lack of commerce in the very early game, prior to Redistribution."
There are early sources of commerce not present in BTS that are present in HR.
Commerce from jungles.
Commerce from savanahs.
Redistribution adds commerce to mines and camps.
Reefs give extra commerce.
So it is not all one way.
Personally I think the problem is the the tendency to hit a wall some where from around the Redistribution column to about the Guilds column.
The Seasonal Palace requires N buildings (courthouses) similar to many other National Wonders. I would not change this good game mechanic. Changing this to N City Halls (or whatever the name) would move the Seasonal Palace earlier. As explained, City Halls really represent the better organization of the empire through a set of provincial governors with some authority to run the routine affairs.
I think allowing the building of a Seasonal Palace early will create more problems than it will solve. A single (expensive) building will substantially reduce the distance maintenance costs in a substantial part of the empire where they were highest.
If it is felt that something must be done in the very early game, minor fiddling with early tech costs, etc. would probably be a better approach.
They're somewhat separate issues. Keinpferd is concerned with a lack of commerce in the very early game, prior to Redistribution. Neither shifting the Seasonal Palace nor a new maintenance reduction building will help there.
He suggested converting the Kiln into an improvement, which may have some potential. This appeals because it could be a source of early commerce that gets replaced by later improvements, rather than lasting all game.
I'm not sure what you mean by this, could you elaborate?
I would not be placing any new maintenance reduction building earlier than Redistribution. In the ancient era it is meant to be very difficult to have a large empire and it's detrimental the progression of the game to change that.
If I did add such a building it would be late classical at the absolute earliest. Maintenance reduction is very powerful and scales significantly. This is why the Seasonal Palace solution is tempting; it's effective for only part of your empire and thus more in line with ramping up the ability to maintain large empires slowly.
This could potentially be done in addition to splitting the maintenance reduction though.