What if we had a pokemon that could automatically set up trick room?
One thing should be noted about Trick Room in that is only affects Speed. Unlike weather, it doesn't affect damage, accuracy checks, or triggers abilities, but only towards the Speed stat. However, Speed manipulation is definitely the stronger effect, moreso than anything that weather can bring. In most scenarios, Speed is the difference between killed or be killed (to be a check or not), and it affects EVERY single Pokemon. Weather on the other hand primarily affects damage dealt or damage taken, and so it's only the difference between hitting hard or hitting for normal. We've seen a lot of hate towards Speed in the past, the big one being the banning of Swift Swim on Drizzle teams. Pokemon had a lot of power with Rain up, but their strengths were further secured with the Speed manipulation that Swift Swim gave them.
That's where we see the strength in an immediate Trick Room, it creates Speed advantages and awkward disadvantages. Suddenly, checks lose their ability to actually "check", fragile sweepers lose their sweeping potential, and many bulky hitters become not only tanky and hard-hitting, but fast as well. Speed investment becomes questionable in teambuilding, and if anything the entire metagame would begin to revolve around bulky hitters to accommodate the unreliability of hitting first (just take a look at the VGC). As for sweepers you'd have Pokes that can utilize TR or can take some punishment without it, and maybe priority sweepers will see a rise as they reliably bypass Speed checks.
TR is also very easy to abuse. -Spe Nature, 0Spe IVs, 0Spe EVs (which means more investment in tankiness), this means that entire teams can utilize it (as opposed to weather with only a few abusers), and your opponent is at an immediate disadvantage if they have any Pokes with Spe investments since they're squishier and now slower. Even if it lasted a few turns, the fact that you save a turn for setting it up means you have no problem getting TR back up.
In another completely different wording, imagine this.
A Pokemon has an ability which, when entering battle, paralyzes ALL of your opponents Pokemon with a respectably high Spe stat, while ignoring any form of parahax. This is almost exactly what TR does; it cripples a lot of fragile sweepers who rely on their Speed to avoid damage. Automatic TR becomes very scary knowing this, as just by bringing it up means that many Pokes are reliably kept in check. Weather can barely do this and if it does it only cripples a select few.
In lieu, automatic TR is immensely powerful and easily abused. Essentially game-changing and even ban-worthy.
Sorry if I went a bit off topic. To be completely honest, this actually sounded much better in my head -.-