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Here's text rendered with Raleway, a font designed around 2012, according to Google Fonts:
I'm far from a font expert, but the vertical zig-zag of numbers looks just jarring to me, and makes the text less legible.
What is the appeal of old style numbers?
Old style figures are used in titles and paragraph text. According to Fonts.com old style is suitable for title and paragraph text due to the fact that this gives the text uniform look. The 'modern' style numbers should be used for tables and graphs, since these modern numbers align better when used in these contexts.
There are fonts that support both old style and modern numbers. These fonts can easily be used for title, paragraph, table and graph text.
You can try the difference at clagnut CSS sandbox, try to select Museo Slab 500 and change the Number Case between Lining and Old-Style.
Examples of old-style numbering on the left and modern numbering right:
I like to compare old-style numbers to lowercase, and new-style to capitals. Some typographers even talk about 'lowercase' and 'uppercase numbers'.
To my eyes, using UPPERCASE in the middle of a sentence seems odd, also when using numbers in the text. old-style numerals just 'flow' better with the rest of the lowercase letters in a sentence. When available, I see them as the 'default'.
Contrarily, uppercase numerals do serve their purpose when large amounts of numeric data are collected in e.g. a table.
The 'zig-zag' is no more than with regular lowercase letters, as Bart Gijssens comments. Take the sentence you just read: the words 'regular' and even 'zig-zag' (including the quotes) are all over the place as well.
Ascenders and descenders of lowercase letters make them easier to differentiate than the blocky shapes of uppercase letters. The same is true when applied to groups of letters as they form words and blocks of text. And is also true when applied to numbers.
The string of text you've shared looks especially awkward as it includes a mix of symbols '/', codes 'FM' '23.64' '24/7' and difficult to interpret wording (what does 'coverage' mean? oh I see, it's a radio station so they mean...).
It's hard to fully understand the impact of lowercase numbers (or old style) on legibility of this particular typeface and the message as-shown are really hard to differentiate as we're mixing so many variables. It could be that the square block-shape of 24/7 vs the lowercase style shown is more familiar and a faster read for your audience.
Generally good type families include these lowercase letters as they round out the options for good typography, and in content often provide the more legible flow/differentiation I mentioned earlier. The larger question of 'appeal' I don't know how to answer. I like the lowercase numbers, especially in a well design typeface, but in some cases they don't fit.
Some fonts just emphasize style and uniqueness over practicality. What you call "jarring", others might call "different" and "attention-grabbing". Many fonts are far less practical than this one.
Obviously, the vast majority fonts don't use this feature, and it is not a good choice for displaying large volumes of text. But it may be useful as a stylistic device to add a certain look and feel to a site or document.
The generalized typography rule being applied is to avoid attracting visual attention to specific words or letters in a sentence because that slows down reading and comprehension by distracting the readers limited attention from the entire piece of writing. Anytime SOMETHING is larger or darker in a paragraph it encourages the eye to skip ahead to the bolder darker, taller letters or words and then after interpreting the capitalized numbers the reader has to visually scan backwards to the beginning to get the whole meaning. The process of skipping ahead visually and then re-reading the entire sentence is quite common. If you want to use the capital letters in a paragraph, typography rules say you should decrease the font size slightly (about 10-20%) so that when you look at the entire paragraph and blur your eyes it should not stand out as different.
the rule and the old style numbers are intended to apply mostly to large written blocks such as in a newspaper column or a book full of text. If you have an advertising piece or it's a headline or the numbers stand alone separated from a paragraph, then typography rules for reading don't apply and it's a typographical style decision you can base on whatever creative or messaging impression you want to create.
