Two general facts about the microphone market seem relevant here.
[1] Good omnidirectional condenser microphones are available in all price ranges from moderate on up. Pressure transducers of very decent quality can be designed and manufactured with skills and materials that are available at relatively low cost. So they're on the lowest end of two spectrums at the same time: directivity, and cost to design and manufacture.
Continuing along the spectrum: The low-end manufacturers mostly haven't moved into the territory between omni and cardioid yet, so the next stop is cardioid. Greater directivity, and greater sophistication and care are required to produce smooth frequency response and consistent polar pattern (i.e. a cardioid that remains cardioid beyond the midrange), along with low noise and distortion, reliability, and consistency. So there are fewer low-cost, high-quality options for cardioids suitable for stereo recording of semi-distant sound sources.
Move along further to supercardioid / hypercardioid / bidirectional, and the quality sorts itself by price to an even greater extent. Both design and manufacturing face considerably higher demands. Low-cost microphones with these directional patterns don't give you as much of what you could get from higher-end products, as compared with cardioids and especially omnis.
[2] Super- and hypercardioid microphones are nearly all designed mainly for speech pickup. They have reduced low-frequency response in order to tame room sound, and elevated high-frequency response to increase speech intelligibility. But you have to be alert sometimes to discern which microphones are made that way and which ones aren't. Note who the products are being marketed to, and which applications are discussed in the product descriptions. If the suggested applications emphasize public address, broadcasting, news gathering, etc., that product probably wasn't designed for music recording from a distance. And as I just said, that applies to most microphones that are "beyond cardioid" in their pickup pattern.
Spec sheets are notoriously unhelpful in this area, I'm sorry to say. Microphone manufacturers often show frequency response curves as they would theoretically occur under conditions of expected use. General-purpose cardioids are usually measured at a 1-meter distance--but a microphone intended for close speech pickup might be measured at 15 cm, where there is much greater proximity effect. At normal concert miking distances, the speech-tailored microphone may well have 10 dB less sensitivity at 50 - 100 Hz than a general-purpose microphone with a very similar published response curve--even from the same manufacturer, sometimes.
A well-made product will do what it was designed to do, whatever that is. The price competition is greatest for the most popular applications (in this case, speech pickup). Full-range music recording at typical concert distances isn't the application for which most super- and hypercardioid microphones were designed, particularly in the low and middle price ranges. And that only increases the "skew" in the market.
--best regards