If you are the DM and you find Pathfinder more cumbersome to run... you tell your players that. You tell them that you're tired of running Pathfinder and that you want to stop. And there it is.
If your players balk... you tell them that while 5E has less options than Pathfinder for players, it is much easier to run for DMs. So if they want you to keep running a game, you ask them to switch to 5E for a while to make it easier for you (and hopefully they come around to it and don't find it as worthless.) If they refuse and demand to stay with PF, then you tell them one of them can DM then cause you don't want to anymore. Simple. You've facilitated their enjoyment of D&D for many years... they now can do the same for you this one time.
And should they agree to try 5E so that you stick with DMing... you can even be extra-nice and accommodating to them by not using some of the aspects of 5E they don't like-- the Inspiration mechanic for instance. That's not actually necessary to the game, so if the BIFTs bother them that much, don't use them. There are plenty of things in 5E that you don't have to use if it bothers them that much, although I imagine once they start playing, they'll realize many of their concerns are not as big of deals as they are making them out to be.
If your players balk... you tell them that while 5E has less options than Pathfinder for players, it is much easier to run for DMs. So if they want you to keep running a game, you ask them to switch to 5E for a while to make it easier for you (and hopefully they come around to it and don't find it as worthless.) If they refuse and demand to stay with PF, then you tell them one of them can DM then cause you don't want to anymore. Simple. You've facilitated their enjoyment of D&D for many years... they now can do the same for you this one time.
And should they agree to try 5E so that you stick with DMing... you can even be extra-nice and accommodating to them by not using some of the aspects of 5E they don't like-- the Inspiration mechanic for instance. That's not actually necessary to the game, so if the BIFTs bother them that much, don't use them. There are plenty of things in 5E that you don't have to use if it bothers them that much, although I imagine once they start playing, they'll realize many of their concerns are not as big of deals as they are making them out to be.