The EOS 4000D inherits an aging 18MP sensor that can trace its roots back to the EOS Rebel T2i / EOS 550D, which was released in 2010. The latest tech this is not.
It's a similar story with the DIGIC 4+ image processor used in both the EOS Rebel T100 / EOS 4000D and EOS 2000D. To put it in perspective, we're now onto the eighth iteration of Canon's DIGIC processor, although the latest EOS DSLRs are using DIGIC 7 chips. Native sensitivity remains the same at ISO100-6,400, expandable up to 12,800.
The autofocus system is also pretty dated it's the modest 9-point system that has been in Canon's arsenal since 2009. And while pretty much every DSLR in the last five years or so has featured a 3.0-inch rear display,