That’s fine, I mean you have your own reasons why you have it fixed as manual (just like I do) and you know what you are doing and you know the risks of sizing it too small, thats fine.
My concern is people adjusting their swap file (sometimes for another game or application) to be a fixed size, based on someone elses online suggestion. I have assisted a few people who have had unusal crashes (not just MSFS) and in nearly all cases the swapfile was set to a fixed size, and when asked why they were doing that, the reply was someone online suggested that to get more FPS 
MSFS uses more memory than any other mainstream game I know of, hence the higher incidence of overall memory running out.
I am almost certain in most cases where MSFS crashes consistantly during an update (very high memory required to unpack) or shortly after startup, the reasons are either Low fixed pagefile size, or NO pagefile size, as I haev even seen some suggestions where people have suggested that if you have 32GB of ram, why do you need a swapfile, to save SSD life!
This is wrong on many levels if you understand how things work underneath the bonnet (I am a developer), but it really frightens me how often i hear a suggestion to disable the swap, and seeing novices actually doing it.