If you had actually read this topic, you wouldn't have had to ask.
1) Fed capitals are plenty effective against Tevs, Fed capitals have advantage in range and tactics compared to average Tev cruiser/corvette.
2) Fed fighters and bombers outperform Tev equivalents.
3) Solaris represent real deterrence unless Tevs somehow manage to find all three with their pants down.
In conclusion. Tevs have advantage in their beam weapons but they are only able to use that advantage in direct head-to-head confrontation within range of their beams. Feds don't have to play into Tevs hands by allowing that. Instead they can disarm these beams fairly effortlessly by using gauss cannons, torpedoes and gunships.
Feds capitals excel at anti-fighter role. It is far harder for Tevs to disarm and disable Fed capitals. Not only that, but Feds gunships and bombers specialize in anti-capital role and they are far more maneuverable than Tevs cruisers and corvettes. And Feds have the means to protect those gunships and bombers while they do their job.
Feds would be able to mobilize far more assets than what Tevs could bring through the one node, particularly when Tevs can't even bring in full force because they have to maintain presence in other systems just in case of Shivans.
The war is not simply about which side has the biggest guns on their capital ships. Beams won't make that big of a difference in grand scheme of things. Yes, it is undeniable advantage, but still very limited advantage.
Not to mention that Tevs would have one humongous disadvantage if they would just storm Earth. They have no target there. Did you expect Tevs to bomb Earth or something? Well, not gonna happen, Earth is their home too and they want it intact. Sure, there are bases around Earth orbit. But they would still have to pick military targets. While Tevs would be busy blasting those stations, Feds would be busy blasting their ships. In the end Tevs would receive huge losses in exchange for few stations.
Tevs need to target Feds logistical support to win the war. All war critical assets are heavily guarded and Feds would get advance warning of every move Tevs make and react accordingly. Direct confrontations in both sides would result in hefty losses for both sides, including Tevs. And Tevs would lose regardless of their advantage in beams.
In short, if Tevs would use direct-confrontation as their primary tactics, they would win battles but not the war. Their war effort would collapse due to losses received. Beams aren't going to change that. Steele plays aggressively, but he's not stupid. He's going to be very careful at managing his assets, logistics and minimize losses, that's the only way to win against an opponent on his home ground.