I'm not trying to be flip but saying that different resources are all the same or all techs are the same really just tells me that this game isn't for you. I'm sorry.
They are not all the same but I do not think they are coming across the way you intend them right now. I am really enjoying the beta already and expect to enjoy the game even more so. I know some resources give more food, but at the moment with how many are present vs how much I actually need and the minimal effort required to acquire one I never feel the need to even check. I have rarely in beta 4 been hurting for any resource and have had surplus of almost everything. Unlike before where I had to sacrifice precious essence to build a settlement it now costs me like 85 gold and 15 material maybe. I do not have to think to myself should I build by the wheat or the fertile land, I just build a town near both.
The more I think about it the over abundance of resources makes for a lot of that as well. I had a large city today whose area of influence encompassed 3 gold mines, 2 libraries, 2 wild wheat, a fertile land an air shard, a temple, 2 ore mines and 3 wild horses and I think a crystal crag as well. I love resources but that seems a little over abundant.
Some of this may be AI driven too. I know there is a lot of effort going in to making the AI work and it has improved significantly, but maybe in the end when it becomes harder to defend all my cities the over expansionist in me will be crushed.
I know also that not everything has been implemented and this is not the real game yet. It just feels like some of the intentions have been under realized. For example you talked about some weapons being faster and slower than others but at the moment it is almost impossible to see. As was mentioned most units only survive till they get hit once and I don't think I have seen any weapon attack more than once. I know you said tactical battles are a work in progress so make sure that intention is realized. I guess maybe I just can not see how the attack speed is functioning so it gives it a feeling of sameness.
How does attack speed work in the current build?
As for the techs they all feel the same because they still come at such a blur. Once the game gets moving it usually takes 3-4 turns to get a new tech (which seems to include between 2 and 10 items). By the time I get around to using it I already have the next one, and it is pretty much the same for spells. I would like to see a little more to start and then take a little bit longer to reach the good stuff. Instead of starting with clubs only maybe start with the first few items, clubs, daggers and axes. Then you have something to work with in the beginning but still have a goal. Make sure that different feel is realized an noticable to the player. ie Clubs cheap, daggers fast lower damage, axe slower higher damage.
Unit upkeep should vary a little too. It takes more gold to keep a claymore and a suit of full plate in good repair than it does a simple club, and the skilled warrior behind it probably wants more gold too.
The other thing is at the moment everyone seems able to get every tech. I don't know if this is something you guys have thought of but for example tech in Master of Orion, unless you were creative you had to choose one tech from a tree and the rest you had to either trade for or hope to find, with a rare breakthrough that gave you all the techs in that field. So for example I research the magic rings, and can choose one that I will be able to make. If I want the others I need to come up with a way to get them.
Once again in Master of Orion some things took a long time to research so you kind of reach a temporary plateau where some things a worth while for a period. If it is going to take me 60-100 turns to research claymores maybe I want to train some guys with longswords in the meantime. Sort of a tech lul where a certain level of item is viable for a longer period. Otherwise right now it feels like a tech race to me that the computer never wins.
In the end Frogboy I like what you guys have done so far. I know its getting close to release and huge changes are not going to be made but take a step back and see if things are going where you intend them to be.
By the way the art style is great.