I would say this is largely accurate, because the competition isn’t really offering distinctive advantages over Apple right now, and there are no real major leads in technology with smart phones at this point, (Which is partially due to saturation), but there will be in the future with wearables, which Apple has a clear lead on right now with the Apple Watch.
But on that note, I’ve said it many times over, it’s _not_ the hardware the consumer is choosing, it’s the platform they’re choosing, that’s the most significant choice of any consumers decision, is if they prefer android or iOS.
There are a few new tech items that others have, that Apple hasn't got yet though, but again, none that really compel me to go back to an Android device. In-display fingerprint readers are one of them(of course, Apple has a patent for a next-gen in-display Touch ID, coming in 2021). Then there are those superzoom cameras(like the 5x zoom from Huawei) and bi-lateral wireless charging(Huawei added that in 2018).
But at the same time, the 2019 iPhones are likely to also have real optical zoom cameras, and bi-lateral wireless charging, which renders those advantages moot.
I think the next big advancement for smartphones will likely be Lithium-Ceramic batteries, which offer higher cycle life, don't explode or catch on fire, can store more energy in a smaller size, are flexible, and are capable of far faster charging(5 minutes to 80%). Best of all, test batches are already in production. This will be a boon for smartphone battery life(multiple days on once charge), flexable/foldable phones, and charging times.
Then, there is also the ability to hide IR dot projectors, ToF sensors, RGB cameras, and proximity sensors under an OLED display, which allows you to eliminate a notch, without adding mechanical sliders and/or sacrificing facial recognition security.
Probably there will also eventually be a faster wireless charging standard(probably based on Qi), that allows you to charge at the same rate as a wired charger(25W into the phone). This, in combination with 60GHz WiFi 802.11AD(for really fast local data transfer), will allow even the removal of charging ports.
Placing the speaker under the display(A-la LG G8), will remove even speaker grills. And possibly, adding piezo-electric elements under the display mean we don't need a microphone grill either.
Those are IMO the main innovations that phones will adopt over the next few years.