Russia has no stuff of the Javelin or NLAWs level but they do have enough anti-tank missiles and produce them in 3 shifts now. Western tanks are far from immune from those.
Also, most tanks are lost to enemy tanks, artillery or loitering munitions.
I know that Russian army looks funny sometimes, but they have shitload of weapons and the situation you describe may happen only against some reserve units somewhere.
I see this trend among the Western public as if Russia is kinda done and will soon fight with shovels. It is not and it will not. They have resources for many years of war and major offensives.
These new tanks won't be an instant I Win button, and there's still going to be a lot of hard fighting, but you're massively underestimating the increase in capabilities. No tank is immune to a heavy ATGM, and in theory those will take out a Abrams as easily as anything else - I say in theory because there's been very few cases of such missiles actually being fired at first-line Western tanks. Most of what has been used has been much lighter and more portable systems that don't have the warhead to punch through from any angle. What makes Javelin so good is the integrated (and very expensive) top-attack function that gets around armor - nothing Russian-made
in that weight class has that capability. This negates a large portion of Russia's deployed ATGM capability.
The extremely good optics and especially night-vision optics will (as long as Ukranian crews continue their stellar tactical awareness and coordination, of course - unlike Russia they've shown themselves to be perfectly capable of providing a proper infantry screen) also make hiding the bigger missiles for an attack much more difficult. Not impossible by any means, but more difficult.
In tank-on-tank fights, the differences are heavily magnified. Late-era Soviet-derived ballistic computers and rangefinders are very good. Current gen-Western equivalents, by comparison, are very nearly black magic. Crews that have used both (both from places like Poland that are transitioning, and evaluation crews on units that have been acquired somewhere or other) have used terms like "war with cheat codes" to describe just how ludicrously fast it can be to track and service a target. The aforementioned incredible optics and thermals are an even bigger factor here, because tanks are fundamentally hot objects.
Nobody with any sense thinks that these new tanks are going to arrive and reenact 73 Easting - the only reason Iraq performed so ludicrously bad in a similar matchup is that they'd been crushed from the air. But they are a massive increase in combat power if used intelligently.