While they are unreasonably annoying, especially so if in hands of a good player and even more on bigger maps where a jack can cross from corner to corner of a 20x20 map in seconds, the main 'power' of jack drops or Pyro drops is precisely in the lobpots you like.
With 10v10 or more players you run into an issue of not having enough production to properly push the frontline if you're facing enemies of equal skill, either a single player that's dueling you or a disorganized ball of 3-4 players.
If you push in too hard you'll probably get swarmed from the flanks, your attack wasted and all that metal you invested now neatly deposited inside enemy lines for them to reclaim.
So considering average lobpot of 2-3 good players and 90% of the rest of us your choices are to either support other players, filling in gaps where you can, harrassing enemies and exploiting their mistakes or doing some meta works-only-in-lobpot strategies.
And right there comes in jack-drops, a more complex to do and direct version of creeping in a bunch of Scythes into the enemy base and dealing mayhem.
There's a lot of players, everyone's doing their own thing, the best players in both teams are probably doing tug-of-war on the front and relying on rest of the team to handle the rear and WHOOP, something flew over - eh the rear line players will handle it - oh nope there goes the geothermal - oh nope there goes 2 commanders - oh nope I can't help all my units are at the front - oh nope there goes another geothermal.
You're winning actually, more metal flying over you than your team is loosing. Oh but the constant rear-line nonsense now has the rear-line players running around like headless chickens, now there's no Eco being made, rearlines are becoming porc towns, someone made 15 storages because their AFK fac assist commander died.
It's not an effective tactic, it takes a lot of set-up to do compared to the scythe infiltration for example, or an even more similar tactic of sneaking in a Djin(or building one with Athena) to start mass teleporting an entire army behind enemy lines to delete enemy teams's eco.
Takes a lot of preparation that you enemies can exploit and if it fails all you did was give your enemy a donation.
Does cause chaos, just look how player cursors move like mad once a group scythe attacks is heard.
Granted I'd vote for a mechanic change that if a unit jumps while air-borne that it should could as an AA target until it lands. Like getting thrown by a lobster then using the units jump-jet.