I don't know if it's lower FPS but anything higher than 30 is good enough for me and i do use Vsync, so i don't have any use for more than 60FPS because i have a 60Hz IPS monitor.
In that sense i prefer having 40 FPS with more consistency than having 60 FPS that dips into the low 20s. Think about it, if the FPS are limited somewhat on purpose the PC has more time to render what it needs to display and this helps maintain a more constant frame rate.
This has been a very often used tweak for FSX as well.
Well, in the current beta patch that's exactly what seems to be happening, most people report lower FPS but more smoothness.
In other words, losing 5-10 FPS is only a big deal when that drop results in your minimums getting below the human eye's comfort zone. If you have 50 FPS pre-patch and 40 post-patch it's no big deal, especially if post-patch is steadier.
And if that drop gets you below 25-30 FPS there is a very easy fix with minimal loss of visual quality: drop your texture resolution one notch, it's the graphics setting with the most impact on FPS.