More isn't always better.
On a sidenote, I also believe this is a problem of many civ6 factions - not that there are too many factions, but they have too. Damn. Many. Separate. Bonuses. If your game is going to have 40 or 50 playable factions, their character and abilities should be easy to remember and recognize. Civ5 did that but it had a separate problem of factional abilities being too specific and niche. So civ6 went nuts.
Let's look at England, as we are in the proper thread. You ask me what abilities does England have in civ5. Well, it has +2 water move, earlier and more spies, xbow with bonus range and stronger frigate.
The downside: too specific, military focused, and does display an extremely small cut od English history.
Upside: simple and very visible!
What bonuses total does England in civ6 have?
1) Iron, Coal mines+2 more resources per turn.
2) +100% Production towards Military Engineers. M
3) Engineers receive +2 charges.
4) Buildings that provide additional yields when Powered receive +4 of that yield.
5) +20% production towards Industrial Zone buildings.
6) Harbor buildings increase Strategic Resource Stockpiles by +10.
7) The first city founded on each continent other than their home continent grants a free melee unit in that city...
8) ...and +1 Trade Route capacity.
9) Building a Royal Navy Dockyard grants a free naval unit in that city.
10) Redcoat
11) Sea dog
12) +1 Movement for all units built in the unique version of Harbor.
13) +2 Gold when built that unique Harbor on foreign continent.
13 separate abilities for one faction! To this day I cannot remember like half of bonuses 42 factions in this game get and I dread the upcoming 8 civs, because as much as GS had cool civ designs, they were horribly bloated. I am not sure but I think Maori may win with 15 separate mechanical modifiers (real "abilities"). In a game with up to 50 playable factions. The brain melts and faction identity dissolves.
Please notice that most of English bonuses are utterly insignificant, something you raise an eyebrow, mumble 'nice' and move on (to be honest if there was a way to measure how civ unique abilities impact victories - if civ6 had any difficulty of course - I wouldn't be surprised if a ton of factions uniques would have no statistic impact at all, their impact being just human cognitive bias).