The biggest problem with running WhatsApp on Android 4.4.2 is the forced expiration policy.
Meta does not let old versions run forever. Approximately every 3–4 months, WhatsApp sends a kill switch to versions older than a specific build. You will wake up one morning to a red banner:
"This version of WhatsApp expired. Please go to the Play Store to update."
Since you cannot update (because the Play Store says your device is incompatible), you are locked out of your account forever on that device.
Android 4.4.2, known as KitKat, was released in 2013. In the tech world, this is considered ancient. WhatsApp initially set a cutoff for older devices, but later extended support for KitKat for a significant period. However, that period is effectively over.
What "End of Support" Means for You:
You need to find a version of WhatsApp that is compatible with KitKat. The latest versions usually require Android 5.0+, so you may need an older version of the APK.