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It's not like YouTube kids was able to serve its purpose anyway.

Their tablets also fail to impress.

As far as I know, no.

If I recall, the US S21 Ultra can b e bootloader unlocked via a service on Telegram but only on a specific Android version. After that version, you are out of luck.

I never got to listen to them in person. I heard so many people praising the speakers at the time.

I didn't know there was an M7. If they sounded amazing on the M7, I can't imagine what they sounded like on the M8.

Is it possible for someone to custom make a bigger battery+case for the HTC One M8?

I had an HTC 10 at the time, around its release date as that was the only phone with a Snapdragon 820 available at T-Mobile in my location. It was an ok phone but got better with a custom ROM+kernel. Shame about no dual front facing speakers on the HTC 10 because the single front facing speaker actually sounded great.

I remember always wanting an HTC One M8 because of the dual front facing speakers.

I wonder if different switches, keycap profiles, keyboard material ect affect the accuracy?

I believe the OP might be the cat. The cat has a complaining pose.