It's especially risky, as to RuneScape gold von Rskingdoms Blog

It's especially risky, as to RuneScape gold the engine all inventories are practically the same thing. Shops, worn equipment, beast of burden, bank, etc... are all the same thing at the core. Game scripts generally define the behaviour for the inventories. That means making a change in the engine to support bank features doesn't just have the potential to break the bank, but practically the entire game.On top of that there's part-deprecated systems that need to be supported.

Any changes that were made to the engine which the client needs to know about would need to be implemented in NXT, java, and HTML5 (in which the comapp is based). All very different languages, which could break in very different ways. It's not straightforward to just turn these off, but it's obviously ideal only to implement in one location.Why did we say we were doing it to start?We were experimenting with ninja taking on larger-scale projects which were Quality of life rather than the typical ninja fixes which had less impact on gameplay than when ninja first started.We had the means to do engine work in-team and looked into a lot of the technical complexity to feel like it was possible, even if it would take a long time.

Ultimately it wasn't possible, but that didn't become apparent until months after we made the announcement at RuneFest 2016.***TL;DW- In short the bank rework as a whole is shelved; we are not working on it and will not be for foreseeable future.- We are investigating bank placeholders on its own as a feature you want. It is at this stage purely an investigation into feasibility, and we make no promises about being able to deliver this.As a note, due to how extremely close to Christmas it is and with buy OSRS gold staff taking holidays, etc our replies will be pretty stagnated, but we'll try to respond over the holidays where we can.Thank you for reading