I agree, but they are doing the best they can without spending over a hundred million dollars in one go. SDC has rebuilt several large sections of the park over the last five years with massive investments into the infrastructure and guest flow through. If the rumors are true, another large section will be redone for the 2023 season with FITH being replaced. Not to mention the area that will be redone soon due to the recent fire. There's also rumors about them rebuilding parts of midtown since those buildings are so old and the area is kind of awkward.
So they are working on it, but unlike many parks the geography has always been extremely challenging and the park simply wasn't originally built with the intention of handling so many guests or even being a theme park per se. The parking lot used to be what is now the main square, for example.
They still need to rebuild the entrance though, and that will be a massive challenge. Not only is it a huge area with a lot of big existing buildings, but they also have to avoid the cave and the existing cable car system, which pinches down the pathway area.
Speaking of the apparent FITH replacement project, when I last visited a week ago, the site was compacted and it looks like most of the underground infrastructure they were burying earlier in the fall is complete? At least from what we can see. I hope that means they are getting closer to vertical construction once the park closes for the offseason in a couple weeks.