There's the rub. With client server there are higher costs and that usually means either subscriptions and/or pay to win.
If ED had been subscription based, i'd probably have never got it.
I'm well aware of that.
Also, i take the game as it is - as in: i'm not the one to complain about clogging or instancing or any other issues that derive from the ED networking model
Point and click MMOs also have a lot less networking overhead than shooters. There is a good reason most online shooters limit the number of players or use fancy tricks to work with higher numbers of players. Like Fortnite has a large map and a shrinking play area over time which causes more deaths. Sometimes you get lots of people landing in the same area and then the jank and glitches really start.
Not sure what you mean by point and click mmo, but DAoC was more complex than a shooter since it allowed toons to move on ground, had keeps and towers that could be climbed upon and rivers and seas that could be dived in and allowed fights in water or between toons located in water and/or on ground.
Also it had the entire arsenal of contact fights (melee weapons, including shield block or shield attacks) and ranged fights (archers and casters) and crowd control mechanics (mesmerize, root or stun spells) and a lot of weapon specific attacks, follow-ups, abilities and/or spells all mapped to 1-0 keys that could be organized in multiple quickbars - most often that meant a toon would be using 20-40 abilities mapped to those quick-bars (as a comparison, ED has 2 triggers and usually1-3 weapon banks, rarely 5)
All of that in real time with really tight timers - a well equipped caster could get 0.8s cast time and could kill another toon in 4-5 seconds.
Hibernian casters were mostly hated since they had a base stun that could last 5 seconds on target (after resists) and they needed 4-5s to kill a toon (but they could also be one-shot by assassins or 2-shot by archers with critical strike)
Sure having 500-700 people in the same area and having nukes flying all over was killer - but not necessarily for the servers as it were for the clients - usually in zerg fights one had to use /effects off to remove most of the graphical effects from spell otherwise his game was running at 4 fps - unless he had a monster computer
But yea, 2001 game tech, but from a company that really knew how to design and balance a competitive MMO and with players willing to pay 15€ per month to enjoy that experience (with a lot of them paying for 2 accounts, yours truly being one of them)