I am a adjustable junky....I will do my best to explain why this is and why I tell every newbie that if the they buy another razor it should be a adjustable (if they have that deer in headlights going on)....
1) I dont consider myself a "razor guy" or have (RAD) so even though I have quite a few razors I dont really cycle through them. In fact I have only used 2 razors in the last 6 months....Now, with that said I really prefer a HEAVY razor and of the ones I have, it seems that adjustables tend to a bit heavier then non-adjustables (the ones I have) and for me that is 100% a comfort/feel thing that I am pretty militant about (YMMV)....
2) To me a adjustable gives you something that no other wet shaving tool can...If I buy a soap/AS/brush/even a razor and I dont like it then I am kind of stuck with it, I cant change the way it smells/lathers/stiffness/mildness/etc..... but even if I dont like the look/weight/etc. with a adjustable it can still be serviceable... I also think what
@PLANofMAN said was bang on, but with that said you have that ability to "dial" in what the best setting for that razor is for you, I know some do adjust the settings after passes (I personaly dont) but that is 3 razors in 1 with out changing the feel of a razor.
3)It saves time and money no just for beginners but if you have different blades you might find that instead of hating a blade, you just have to use it at a different setting and it turns out to be a blade you now love instead of writing off as "not for me"..
Again adjustables are NOT the end all be all but a lot of that comes down to YOUR prefered razor and what you are looking for in one...I dont say any of this to try and convince anyone on adjustable's, but rather why "I" use/love them....if you have razors that you love and prefer then you might have a let down when/if you get one...Hope I didnt make things even more blurry.

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