I have a good number of apps installed on my various Boox ereaders. No significant issues for those apps that I use once I have them optimized for my device.
As for other apps, that would all depend on the specific app. Some apps don't work well on eink devices.
Although I don't do a lot of browsing on the internet, it is fairly pleasant to do so on the newer Boox models. Just make sure that you have the device in A2 mode to make scrolling smoother.
Although the stock browser is fine, you might want to try einkbro which is a relatively new browser and which was specifically developed for eink screens. I have now installed it on all my eink devices. Works quite well. You can find it to download from a number of places, including the Google Play Store:
https://play.google.com/store/apps/d...hl=en_US&gl=US