It makes the site feel like Facebook messenger or something like that while on a phone... Currently the site is relatively hard to post to and embedded videos won't play on most phones.
More then that....
Using this site on a mobile device browser presents some rendering issues, pain in the ass having to zoom in and out to read certain threads, responding to threads is also exhausting as the text box in the browser isn't always as user friendly, have to scroll back and forth to make edits, and YouTube videos will not show on the mobile browser.
Now what Tapatalk does (for free) is it takes the forum and puts it into a modern interface (not like that WAP site you have) that allows for easy reading on mobile devices, subscription and notifications to certain threads, and even YouTube access. Also, single sign in where you can use one login for all the forums you read. Plus its very very very fastt to load.
And it would be free for Ron to setup and free for all of us to use.
This video might help a little