Why replace, My vintage ex army Land Rover still has a function and parts are available... .
Why rest? Many of my acquired software will not run on later stuff, and why the f.... would I want to buy something that means I will have to buy another load of software that only does what mine does now! It would also have complexities that are not needed and also need retraining. Sorry I guess you are also the type that buys a new Ferrari when the tyres need changing!