Apart from Leopard tanks, Ukraine is getting lots of weapons
economist.com
economist.com
https://www.dailymail.co.uk/news/article-5332247/The-4millio...
While during the Cold War they were deployed in numbers, they appear to be being picked off as they are sent in to battle alone.
There are a lot of potentially available Leopards in Europe.
While the American Abrams requires jet fuel and constant maintenance, so not very practical in this war.
Let's not let the perfect be the enemy of the good. (And that's assuming the article is even accurate/relevant/applicable, which the Daily Mail isn't always.)
https://en.wikipedia.org/wiki/Honeywell_AGT1500
Poland already has Abrams tanks and is buying more, so there is infrastructure. I also assume that Poland buys Abrams because they work in that kind of environment, which is similar to Ukraine's.
Fact is, both the U.S. and Germany are reluctant to ship, so excuses are being used. Germany is the easy target of scorn, so the press talks about Leopards.
The problem is way, way more complex than you think it is.
The systems which need protection also protect their protectors, in complex ways, against different threats. As a simple example, some weapons like howitzers are kept well behind the front line and shoot across it. They protect the front-line troops, but if the troops weren't there the enemy could reach the howitzers.
Leopard 2s are maybe the best tanks in existence, but I suspect the real reason is logistics. There are many Leopard 2 tanks near Ukraine, so getting them there is easy. They're also easier to maintain that the Abrams tanks.
They run on diesel, are easy to operate and close to Ukraine.