It's a matter of trade-off. Yes, Tokyo Disneyland's entrance objectively looks better. However, they straight-up leveled their OG turnstiles to put the new ones in. It looks great now, but the tradeoff was that entering the park was a slow, ponderous, compromised experience for well over a year.
Disneyland clearly chose to do the change in phases so as to minimize, to the extent they can, to the guests that are on the ground waiting to get in. They chose to not completely level the turnstiles to expedite the process. It's very possible that with the modern needs of DL, they were forced to make some less-desirable changes quickly to keep the process short.
So, really, there were two options. Option A (Tokyo) clearly looks better when all is said and done, but it would have meant a much greater, sustained impact on entering the park-at a resort where there's considerably more parkhopping, which is comparatively disincentivized in Tokyo vs everywhere else. And then people would have complained about that.
I can tell you that entering Tokyo Disneyland certainly wasn't a fun experience in 2019 when half of the entrance plaza was dirt and the entire entering crowd was then shunted into the other half of the turnstiles-and this is Tokyo Disney, where (at the time) resort guests entered through a designated lane 15 minutes before park opening, and absolutely no one else enters the park before opening in any capacity-no World Bazaar, nothing-until it's *exactly* opening time. And it's Tokyo, so no matter what time the park opens, there's already a huge crowd sitting and waiting an hour before the park opens.
Now, to be fair, we don't know exactly why Disneyland did not make the new gates look like the old ones. It could be cheapness/they don't care/efficiency at all costs over aesthetics/etc., but the fact is that we don't know. It's possible that this was a change they weren't intending to make but had to be done unexpectedly. They could be wanting to go in and make changes later, and not when the busiest crowds of the year are about to stampede through the door in a few days time (frankly, reasonable to me if true). They could fix the turnstiles like they fixed Alice years after they had to put in that OSHA scaffolding rather suddenly.
Is this great? No. But do we have the full story of why this was done in this way, and definitive proof that it will stay like this long term? Again, no.