Tab is convenient and all but if you know which notes to play and where they are would you ever really need to detune with a 5 string? I mean there is the obvious where a song goes below that B but I’d imagine that’s pretty rare.
I’ve gotten comfortable with my 5 and I’m just thinking if a song is ever more complicated than a drop D I’d rather just play it on the 5 and not worry about it.
No it’s not a common thing. If you need to constantly play notes below standard B then get a SubOctave bass, 
It’s still a E A D G tuning but just an octave lower.
Absolutely.
So many detuned riffs are built on open strings that if you play then on a non-re-tuned 5-string, they become difficult to play (fretting wise) or just sound so different.
If the riff has a huge open low string, I always will re-tune to that so that I can keep the same fingering and - most importantly - have a big open string to match the other open strings.
Songs are written for drop A, 5 strings tuned down a step, etc.
You’ll probably not encounter those outside metal though.
Ok now I want a 4th bass 
I get that but usually open strings sound limp to me like I could go to the 5th fret a string down and have a better tone. Just my rookie opinion though.
Unfortunately, I do 
Playing in a band where the guitars are always tuned down (D# standard, Drop C#, Standard C#…) would be a headache if I didn’t at least tune half step down (A# standard).
But then it stays as it is: I decided that if the fingering works, low D etc is played on the 5th string
I’ll throw in my (possibly ignorant) opinion too. I don’t think retuning should be necessary unless you’re playing chords and not retuning makes that more difficult.
One of the main reasons I got a 5-string pretty early on in my bass playing was so I don’t have to retune for songs in Eb tuning or drop D tuning. I’ve yet to encounter any difficulty. (I don’t play, or intend to play, metal, though).
Obviously, if the song goes below a low B, that would be different, but I’ve never encountered that (again, don’t play metal).
I think the bad rap 5-strings get, even for beginners, is overstated. I got one when I was still a beginning bass player, even though multiple bass players/teachers on YouTube and elsewhere said not to. I didn’t find muting a 5-string any more difficult than learning to mute on a 4-string, especially since so many songs don’t require the B string anyway, so I’m just resting my thumb on the B-string instead of the pickup, and otherwise there’s no difference. The very slight increase in difficulty at the very beginning was more than worth it for me to be able to play every song I want to play without having to retune my bass. 
I’ve also found that it’s not uncommon for songs to be easier to play on 5-string, because you can stay in one position using the B string instead of shifting so much.
I also got rid of my 4-string a year or so after getting my 5-string, which also goes against the common advice you hear. But I didn’t play it once in that time, and I haven’t missed it since getting rid of it. Of course my 5-string Ibanez is way nicer than my 4-string Squier was, so that’s obviously a factor.
I’ve now gone pretty far afield of the original question lol. Sorry about that.
That’s awesome. I was all about my stingray sub 5 but I traded a wood chipper for a Fender Squire Jaguar with flat wound strings and I just love the feel so much. The atrings also let me play a lot longer since they aren’t digging into my fingers. I need to get back to my 5 though. It weighs a TON but I really do love it.
Maybe I’ll get flats for that too
That sounds like a fantastic trade!
I watch that video as much as I can. I really dig that sub octave, and Nate makes it sound gooooood.
I play a few drop D and Eb standard songs and I always play them on my 4 strings because like Gio said, it’s usually easier with the open strings.
If I only played a 5 string would I drop tune? I’m lazy so I’d do whichever thing is easier 
I have 2 basses. At some point, I wanted to have something with a bit more growlier sound than my Yamaha TRBX 304 (it’s an Ibanez something, keep forgetting the exact name. It is green).
I thought I would tune my Yamaha to Drop D and switch to it for Drop D songs.
But: For me, it is faster to tune the E string to D and stay on the Ibanez. For every other tuning, I use my Bass Whammy to “detune” when practicing.