So far, the only XO planets we can find are too big, too hot or too cold or too close to the star or lack atmosphere to be habitable.
And we can only look at stars whose planets happen to be in the side facing us. If they are at 90° then they are invisible to us......................
The original estimate for detection of planets that size by Kepler was between 40 and 50. The really big planets close to their stars are easiest to detect and verify, and that’s also true of the Kepler capability. Looking at sun-like stars wasn’t a priority. The speculation about atmosphere isn’t in the Kepler data. Relying on the ecliptic orientation of the stars remains the best method at these distances, and viewing 100s of 1000s of stars means lots of detections, since a rather large number will be lined up adventitiously, hence, the initial data yielded thousands of exoplanets.
Kepler-1649c
https://www.nasa.gov/press-release/earth-size-habitable-zone-planet-found-hidden-in-early-nasa-kepler-data
[snip] While previous searches with a computer algorithm misidentified it, researchers reviewing Kepler data took a second look at the signature and recognized it as a planet. Out of all the exoplanets found by Kepler, this distant world – located 300 light-years from Earth – is most similar to Earth in size and estimated temperature. This newly revealed world is only 1.06 times larger than our own planet. Also, the amount of starlight it receives from its host star is 75% of the amount of light Earth receives from our Sun – meaning the exoplanet’s temperature may be similar to our planet’s, as well. But unlike Earth, it orbits a red dwarf. Though none have been observed in this system, this type of star is known for stellar flare-ups that may make a planet’s environment challenging for any potential life. [/snip]
Kepler-452b
https://en.wikipedia.org/wiki/Kepler-452b
[snip] Kepler-452b orbits its star at a distance of 1.04 AU (156,000,000 km; 97,000,000 mi) from its host star (nearly the same distance as Earth from the Sun), with an orbital period of roughly 384 days, has a mass at least 5 times that of Earth, and has a radius of around 1.5 times that of Earth. [/snip]