[ghaff]

Now you're taking up a fair bit of front of the phone real estate (and adding some cost) for a feature that I'm guessing most people don't care about. [ADDED: As others note there are potentially other options though that don't involve putting the home button back.]

[mjcohen]

My Samsung S10e has the fingerprint reader on the power button. I have it set to recognize my left index finger and right thumb. Works great.

The touchID on my new MacBook Pro is extremely useful. Trained on right index finger.

[koyote]

Fingerprint readers have been living under the screen in other phones for several years now.