You don't have a problem with it as you've not experienced it in a better way. Because you guys don't have a problem, it doesn't mean that problem doesn't exist.

Although the post content is a decent size, forum and post titles are not, the quick reply box is laggy as hell, and far too much zooming and scrolling around is required and is something that shouldn't need to be done.

Surfing a desktop optimised site on any phone sized mobile device is a counterproductive exercise and Tapatalk eliminates this by taking the content on the site and optimising it for mobile use. It's so much faster, more convenient, easier to upload photos, get live notifications on your phone of replies or messages... its such a step up that once you use it you'll realise just how frustrating it is to use the web browser.