Simple answer is YES.
Most currently available computers or devices still use an AC wireless client card.
The tower model TC is AC wireless with 3x3 .. that means it can do up to 1300Mbps link speed. Actual throughput is about half that in best case scenario.
More complex answer is maybe or no.
First factor.. range. The TC is a 7 year old design. It was introduced in 2013 using standard previous designs.. ie it was never a bleeding edge product. It hit the market as yet another AC router which were around for a few years before Apple joined the picnic LATE.
The big improvement in later products is not so much speed but range.
So the TC is just as fast as other wireless routers if you get up close and personal. After that a better wireless router will streak ahead.
Second factor.. age. How old is your TC? Emphasis here is how long has it had power applied to it, as all routers die.. but they get sick and slow before they go. We find Airport routers do suffer speed and range issues as they exceed 3 years. Time Capsules worse as they draw more power and run hotter.
As with any product there are good ones and not so good ones. My early purchases of Time Capsules came up with a dead out of the box, and a poor wireless range out of the box. It barely reached the next room. The third one I got was OK. But they were never power house wifi devices. As much as you might hate external antennas they work. Apple built it too compact and the antennas are too close together and too small.
Third factor.
Mesh vs wireless extend. Apple used a standard wireless extend setup, albeit, unique to them.
If you want really good wireless coverage without ethernet mesh is head and shoulders above airport extend wireless.
Mesh is now one of the most popular choices and even Apple sell the Linksys Velop system (with zero support) in their stores. As wireless becomes more important the Apple limitations with number of devices sharing and the problems to do with Apple controls.. means they are less viable than before.
Mesh greatly improves roaming so you get good signal and connection as you walk around the house with iphone or iPad. Not perfect but improved.
Other things will doubtless come to mind..
I still like the TC and I still run a couple of them.. much modified. But the time to change over is rapidly approaching and all our knowhow for Apple routers will become as valuable as running film development.