In one of my games i started building my 7th night base at 21:35 on day 14 (i spent day 7 on a POI)...
it was a raised walkway 15 long that ended in a little 1 square wide room big enough for me to stand in and not get seen from the sides...
I didn't even upgrade the wood frames except for the ones on the sides and directly under me.
Every zombie came up the ramp, and straight down the walkway single file, where an SMG i'd found and a shotgun i'd found reached the bottom of the horde in about 2.5 hours.
again...i build my "base" for the horde in 25 in-game minutes...
That being said, the changes feel redundant....in A16, people avoided the 7th night horde...dug underground or some other method to cheese and not fight it. One big reason was because there was no benefit to fighting the horde. it ONLY reduced your net supplies...it cost you ammo, repair materials, etc...and it gave you nothing.
Then A17 comes along and changes the system to xp only...fighting a horde night will net you several levels in the space of a few in-game hours...now your decision to fight or avoid the horde had MEANING...you could fight, and gain fast progression and valuable skill points...or you could ignore it, and miss out on the xp.
But at the same time, at the same time they made the choice of engaging or avoiding the horde meaningful, they REMOVED THE CHOICE...now everyone fights the horde...the only way around it is to cheese it, such as with a vehicle or swimming on a lake.
I like the benefit of fighting it, and the change to xp alone would have been enough to get me to do an active defense (i love using funnel approach bridge bases now), but i also play with a friend who would rather avoid the horde, and truly sees the zombies as obstacles to be avoided.