In the dark ages of photography, serious photographers spent a bit of time finding out what film and developer suited them and then stuck to the combination like glue.
Quite.
I have tried (some only once) Microphen, Promicrol, Unitol, Acutol, Acutol-S, Johnson's Universal (or was it Universol?), Rodinal, a Johnson's
Pactum (that's the packaging) developer, probably a standard MQ one, and (probably) D76/ID11 for the few commercially processed B&W films I haven't done myself. In that lot, the only one I could actually see a difference with was Acutol - and that only on certain subjects. Mainly an old stone wall on the village church.
In films I've used Panatomic X, Verichrome Pan, Plus X, Tri-X, PanF, FP3, HP3, KB14, FP4 Plus, PanF Plus, CHS 100, a Kodak infra red film. Possibly a few others. Again, grain apart, not much difference to my eyes in the prints. Not liking grain, I use the slowest film I can. In the 1960s, apart from the very few deviations (usually no more than one film) I used PanF and HP3 when I needed the extra speed. I always thought medium speed films where too much betwixt and between, compromises.
So now it's PanF for preference in medium format, FP4 Plus when I can't avoid it, and FP4 Plus in large format.
My choice of developer, given I couldn't see much difference, was down to convenience, which means one shot made from a liquid concentrate. So Unitol until its passing, and then Rodinal. Rodinal was my choice as much as anything because unlike Unitol the formula was published, so I could always make my own if it went the way of Unitol.
What you will gain (tongue out of cheek) is a better appreciation of the subtle differences (if there are any) because you will be looking for them. I was looking only at the prints I got, which means many differences would be ironed out at the printing stage. Whether you can actually make use of that information in the field - presumably needing to keep a lot of different films and developers on hand to match the exact combination to the subject at hand - I wouldn't like to say.
You might also derive a lot of enjoyment and pleasure out of your researches - as my old school motto had it
Labor Ipse Voluptas. And you'll be uniquely qualified to advise others.
So, not all loss.