Not all-in, you want to get a competitive castle timing. We’re atm very lucky, as Sotl covered a showmatch between HOANG and Phosphoru, where HOANG shows concepts that can work against the strat, against the atm possibly best player (and kinda inventor of the modern form) in it.
Here the Playlist, atm 4 of 7 games are visible:
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Usually HOANG tries to go Archers against that strat in early feudal, also with tower rushes associated (though the towers often just don’t really provide a lot as it seems). But it’s not a lot of aggression, just enough to keep phosphorus eco idle. If phosphoru wasn’t such an amazing defender (and I think he’s probably one of the best defensive players in the game atm, when it comes to early defending) he would for sure also lose some vills, but he surely has a lot of experience with this situation and keeps vills alive that probably even lots of pros would lose already.
But the strat from HOANG is definitely only to herass Phosphoru, get down the defences (towers) and then get to castle and beat him with better eco. This definitely can work, and this is also shown in the very first game of the series. Against Portugues, which are actually atm probably the best to perform that Phosphoru strat, as Organ Guns are just melting feudal units. But HOANG made it work.
The issue with the archer opener is ofc, that archers are terrible against most Castle age units, so you should never make too many of them. Especially as in most situations you want to pivot to cavalry later on. Because the next thing that comes after the UUs is usually forward Siege.
And that’s the point which makes it so tough to defend in Feudal against it. You don’t have an answer to a high-DPS UU plus Siege. The best thing is probably scouts, but even scouts often just die to the initial opening, as their health pool isn’t that amazing. And for scouts you need an absurd amount of farms, which costs eco investment - and are also in that mass often very exposed to being sniped. Ofc you can buy food, but at some point the price is just absurdly high. Therefore usually the archer opener is chosen over the scouts, even if archers will fall very quickly to the UUs - because they allow to get up to castle age way quicker.
For me that’s rn the biggest issue. If there wasn’t the issue with feudal having no answer to Siege + high DPS unit, it would be way more managable with a full feudal. Possibly even with archers, as they can be garrisoned to increase the damage of your towers - which doesn’t helps a lot against Siege.
Possibly one idea would to buff Towers just a bit against Siege, so they can be used to shoot down the low numbers siege when garrisoned. Ofc only enough to deal with lower numbers, as more would lead to griefing strats, which we don’t want.
This is btw independent of using UUs or Knights/Xbows/CA as castle age all-in strat. The moment Siege is added it becomes extremely difficult to deal with in Feudal, especially Archer civs struggle as they often don’t have bloodlines for their scouts, but it’s also tough for cav civs - I wouldn’t even try an Feudal all-in with Georgians against it.