5e has an awful lot of full casters.
Yeah, it kinda does.
There really isn’t any significant loss in room.
No? Compare classes with one Extra Attack on the base class to those with it in a sub-class. The former are 1/2 casters, the latter full casters. The Fighter with two more extra attacks, can be a "1/3rd" caster.
The price of that first Extra Attack sure
seems high.
And, it's understandable, multiple attacks compatible with focus-fire have been problematic in every edition, they act as multipliers to any per-attack damage bonus you can come up with - and all weapon attacks already add STR or DEX mod to damage.
No class relies entirely on EA for damage output. Having it doesn’t put Warlords on equal damage dealing footing with anyone.
Overall, in 5e, everyone is on a more or less equal damage footing, the trick is getting that theoretical overall damage out of at-will grinding and into versatile resources that can actually be used for support.
anyway, as I’ve stated over and over, allowing riders on an attack, and features which replace an attack, can make for a Warlord that can choose how frontline they need or want to be dynamically
Attacks are at-will, so that reduces whatever those riders can reasonably be to minor spammable perks even lower-impact and less significant than BM maneuvers. Support contributions aren't just the kind of things you can grind out a little at a time each round, sometimes they have to be reactive and significant.
There's a reason the BM falls so far short of the Warlord, and giving the Warlord base class Extra Attack just pushes it in that same direction.
Every single archetype should be capable of being played as a warrior
So you're writing off at least one of the more interesting and unique builds, completely. I'd prefer the 5e Warlord, no longer constrained by Role, to actually add
more viable character concept & playstyle support than it did in 4e, not less.