Content is continuously OSRS gold added to the game and the improvements to the game will never stop appearing. Sometimes, this may be a negative, especially after the monetisation scandal a time ago. The introduction to real-money transactions using treasure keys created quite a controversy, but nothing the gaming industry hasn't experienced before in FIFA points, however.
Even though they're still in existence, they aren't as bad as they once were which comes from a studio which has a solid understanding of its fan base, while being aware of what needs to be done to keep its existence alive. An ideal balance was the outcome.
If you're looking to get back to RuneScape who is a bit intimidated by the style and experience of 'RuneScape 3' There are two options to make the play and look more familiar. If you're interested in all visual and content enhancements You can go into Legacy Mode which takes away the contemporary MMORPG features leaving you with the basic point-and-click system.
Another option is to choose to play Old School RuneScape which is the original version of the game, secured and maintained through regular updates, but it will only ever feel, look and perform the way the original game did. The downside to this is that you have to join a paid-for membership to get access to all the worlds on offer. Only a handful of games are available to free members.
And now for the elephant in the room, is RuneScape pay-to-win or pay-to-enjoy or pay-to-anything? Absolutely not. Even with RuneScape gold a totally free account, there is plenty of content to take pleasure in than what's available in a few PS/$60 AAA release.