From the "Better Together" 1.2 update, this has been a problem thousands of other players have reported except through the Mojang feedback site. Mobile players (Android, iOS, etc.) currently have minimal but sensible reach. However, for other platforms like Windows 10 and consoles (Xbox/Playstation), their reach has always been unbalanced. Other platforms can reach each other from around 4 blocks and it increases as you sprint and combo. On mobile, you can hit from around 2.5-3 blocks.

If needed, I can get video footage of accurate testing, but I have a video below showing during a PvP match with friends who both just downloaded Bedrock Edition from owning Java), the enemy team had PC players and they were reaching the mobile player from a ridiculous distance mobile players cant. They were constantly taping their screen but it refused to reach or hit. After the years of thousands of feedback from forums and even subreddits complaining about this, I've decided to submit a bug report because I thought that if its been a problem for this long and no changes have been made, then it was possibly unintended by Mojang and needs to be brought up via the bug report site.

What I feel like could be done is either decrease the punching reach for other platforms to match mobile or increase the mobile punching distance to match other platforms or finally find an in-between for all platforms where they all reach the same. I apologize if this is worded poorly, but I hope this finally gets looked at.