I realise I’m whistling into a gale here. But if you want an expression that will cover everything from Kölsch to porter, taking in saison, IPA, mild, Oud Bruin and Alt on the way, then it’s “warm-fermented beers”. Not “ale”. Please. Because if you use “ale” in a broad, ahistoric sense to mean “any beer made with top-fermenting yeast”, then you’re making my job harder than it should be.
Now, I know that “ale” has already changed its meaning over the centuries. Many words have suffered semantic drift as they travelled downriver towards today. My favourite changed word is “soon”, which originally meant “immediately”. You can see the same sort of slow alteration in meaning at work today on “presently”, which is heading the other way, with many people using “presently” to mean “now”, when it used to mean only “in a while”.
Among the many other words that no longer have the meanings they used to, there’s “decimate”, which was first used to mean “kill one in ten” but now (presently?) means a much looser “subject to considerable loss”; and “fulsome”, which originally meant “abundant, plentiful, full”, then “disgusting, repulsive, odious”, so that “fulsome praise” meant praise so greasily insincere it made observers sick. It has now been reanalysed by many to mean “effusive, enthusiastic”, producing much spitting from pedants, who will insist that this is incorrect, and that a “fulsome welcome” shouldn’t, properly, be welcomed at all.
So with “ale”, a word derived from the Old English alu, which once meant “unhopped malt liquor”, in contrast to the continental hopped bere that arrived in Britain in the 15th century. By the 18th century, brewers were adding at least some hops to everything, so that “ale” now meant “malt liquor that is hopped, but not as much as beer is”. Thus the Encyclopedia Britannica of 1773 defined the word “ale” as “a fermented liquor obtained from an infusion of malt and differing only from beer in having a less proportion of hops.”
It’s important, if you study the history of brewing, to know this, to know that porter was a beer, not an ale, because it was heavily hopped, that all the many varieties of ale brewed around Britain – Burton Ale, Windsor Ale, Dorchester Ale, and others – were called ale because they were lightly hopped, to know why recipes for pale ale and pale beer in 1773 could differ so much, with the pale ale only lightly hopped while the pale beer was stuffed with hopcones; and to know that the London ale brewers were a completely different set of people to the London porter brewers. (Spot the two terrible errors at that link, btw.)
It also means that you’ll have the knowledge to see ale and beer as the two great rivers, the Euphrates and Tigris, one originally unhopped and then only lightly so, the other hopped from the start and then increasingly hoppier over time, from which all British beer styles are derived. Mild and old ale sprang up alongside the River Ale: porter and stout along the River Beer. Eventually, of course, the Euphrates and the Tigris run together, and so did the Rivers Ale and Beer, at a place called Pale Ale, the name of a lightly hopped fermented malt drink in the 18th century which became the name of a heavily hopped drink in the 19th century, after the success of “pale ale as prepared for the India Market”.