I'll say that my Truck build, now in it's 10th year (RestoMod), has been an education.
1.) Company's go out of business. Wheels get discontinued, Suppliers merge or close.
If there is a sweet set of rims out there, go get them now. I nearly blew it with Enkel Grab 6. They stopped (G6 Production) last year. There was not to be any other wheel, and Ebay saved my butt.
Equipment you like will need your imagination to maintain. I have a hard tonneau cover for the back that is flush mount. The rubber gasket dry rotted in storage, and now I have to fab up a different bed gasket design, as the org maker stopped production years ago.
New stuff that replaces old stuff, will drive you bats. I changed my front grill 4 times as they got "cooler" over the years. Pick one, or it'll suck money away from other stuff.
If the Sonic stays popular, and Horse Power demand is high, then motors down the road will blow away stock. Aftermarket blocks, internals, and transmissions are all in its future if it does. Once they get past most state emission years, it's game on for HP.