So um sorry if this post makes me seem like im two-faced, but trust me it doesnt.
So i first complained that sand cores make this OM mundane since it was very easy to win and almost unstoppable with a perfect set-up. But heyIm not really wrong and not taking that back, but the metagame has amazingly adapted to it, providing it many various checks. So what am I pointing out?
I dont want excadrill banned, sand force on it is the thing that needs to get attention. Excadrill is very volatile under sand, sporting a good speed tier to outspeed everything in sand, and sand force just makes it even harder to stop. But like I said, this is not very problematic thing since we're anyway just started this meta, and we have developed numerous checks and counterplays to beat this beast down.
Dedicated physical walls
There are very limited switchins to slowbro
under sand. Slowbro-Mega, Gliscor, to name a few, are very viable mons in the meta atm. Their gigantic physical defense can chew a hit even at +2, and has their own decent offense stats ko back with their STAB moves, making them a reliable and not a passive answer to it. Stuff like mandibuzz,regular slowbro,hippowdon and pelipper must deserve a mention for being a soft check by taking a hit and koing back. I feek like im still missing a lot of checks, but these are the common walls that stop it from a rampage.
Priority users
Priority is one of the nicest stops to excadrill, and Conk and Azu are the most notable users of this. Priority slips past to excadrill's humongous speed, and these two's powerful atk stat can pick off a weakened excadrill easily with stab priority, and even from full, providing that Conk has gotten the guts boost from flame orb, or a banded Azumarill.
Weather Summoners
Pelipper is the most notable one in this, as it can switch in into anything excadrill has provided rocks arent up, and reverses the weather to rain which makes it more tankier as it gets a benificial recovery from rain dish, aside from the reliable roost and a possible leftovers. Other things that switches the weather to anything not sand would immediately stop, since excadrill isnt really that fast
outside of sand, and is koed by anything faster that hits hard enough thanks to its abysmal defenses (though high HP). This meta has been a weathers war, so if someone uses weather to win, why not use weather to stop them?
TR
Probs the most niche from its checks. Just a simple desc for this one, Trick Room nullifies the sand boost by basically making slower mons move first, which makes fast mons in general and not only Excadrill be checked and koed by powerful slow breakers.
This is only to name a few checks, and Excadrill will get more of this if sand force itself will be removed from it. Besides, Excadrill isnt really threatening outside of sand anyways, and depends on it most of the time to get most of its KOs. Regular Excadrill with no Sand Rush+Force in OU isnt really troublesome and is checked by a plethora of mons.
So yeah here we go
TL;DR: Excadrill itself even with sand force has a numerous viable mons as checks and few counters to name with and doesnt really deserve a ban, and sand force is the lone reason to make it unappealing in the meta, and seems like a better option since we can ban abilities themselves.
Banning sand force would be better itself, as excadrill would still be usable as a sand sweeper (without the 1.3 boost this time) but way more manageable this time, and can stop certain meta threats like Magnezone with the SpD set which can take special hits nicely like Magnezone's coverage moves like HP fire even with the Specs and Analytic boost, thanks to its huge HP stat and decent SpD. Plus, mold breaker lets break through Levitate, Sturdy, and even Magic Bounce in a defensive stand point to set up rocks vs those mons. Excadrill is a fun mon, Sand Rush+Force is really just to bleh tbh.
P.S.
Posting calc if you need them to prove that sand force is the only problem(and when I have time).