That’s just an excuse by reddit. Moving to the new style allows them to choke down and control the way that posts and replies are displayed and nested. This is good for them, because it allows them to offer white glove PR services to paying customers. It also obfuscates useful user supplied content so that it can be sold wholesale to anyone who has the money to buy it. That’s more important to them than offering a good user experience and useful website to the proles.

Anyone still posting on reddit (who isn’t a bot) is working for free for an unscrupulous company.