Lich have to use this 4 troops in order to win atm, is not as easy as some patch before, i have one human Acc , castle 32, and one Lich castle 31, on both accs im around top 1X. Dueling at this points is all about what units to use and and where, there are some common setups that people use (lets call it meta) but when you start merging other troops the meta starts to crumble and is all about positioning. I do believe that your point of view is based on the lack of experience on dueling or probably youre in a realm that dont have a lot of action in pvp.
I can have 6 Gold spiders atm but i use 3 Gold spiders, 2Gold mummies and the rest are gold skellies, they are bananas.
I have tons of experience dueling just not at 30+ tier because all the servers i play on implode by that time the highest i've gotten to was 25 before the whale was at tier 33 when everyone else
was 24-25 with a few other whales at 28/29. Before that i got to 23 before a whale killed off everyone with his wallet by destroying every single castle 20+ garrison every 2 days to stay ahead and basically killed off the server by himself. As for dueling experience I can easily tell you no matter what you run if you run into a 80might/20stam jacques you will lose unless you are atleast 2 unit tiers ahead or if you have a jacques himself its absurd. For all the f2p playing mass spiders and spamming summons into the backline while ignoring open favor is generally the best way to win as lich v human since 90% of the humans that know whats going on opens favor you just choke them with units as your 4 gold spider + mass silvers in the back delay the front while in the back is getting shredded by summons. I've easily beaten humans fielding 4 golds on me plus full silver without me fielding any golds at all its sort of a joke how easy it is, if you place swords properly you'll shred them into pieces like a joke.