I have not been able to get those old pixelpunching programs work to
my satisfaction (ie DPaint3-5).
Which is not a problem of the emulator but of your config. DPaint only runs on an unpatched native Amiga display. If you emulate a graphics card it does not run in the same way as it does not run on a real Amiga with graphics card.
DPaint 5 works perfectly on WinUAE for me.
Generally every software works on the emulator even better than on the real machine. The advantage of the emulator is that you can easily adjust the emulated hardware to match the software requirements while on the real machine you are stuck with that one configuration. By tweaking the emulator's hardware configuration you can make almost every Amiga software run on the emulator while it possibly cannot be made to run on the one real Amiga you own.
Bye,
Thomas