Some basic messaging apps may still support older versions of Android, though they will not connect to the WhatsApp network.
WhatsApp APK for Android 4.4.2: Everything You Need to Know Finding a working version of the has become increasingly difficult as the app modernizes its infrastructure. While users with older hardware often seek "the latest version" for their devices, the reality of app support on legacy operating systems is complex. Official Support Status for Android 4.4.2 (KitKat)
Focusing resources on modern operating systems allows developers to ensure stability and speed for the majority of the user base. Risks of Using "Latest Version" APKs on Legacy Devices
While it is frustrating to lose access to essential apps on perfectly functional hardware, the shift toward Android 5.0+ is a necessary move by WhatsApp to maintain the security and integrity of its global messaging network.