Its true that good benchmark is extremely hard to get right specially for complex tools like these or databases. But I honestly think thats the secondary reason

Its true that good benchmark is extremely hard to get right specially for complex tools like these or databases. But I honestly think thats the secondary reason, the primary being stopping someone from truly evaluating their products. Essentially you will then have to rely on sales reps and some hearsay from other users and you are less likely to have someone who have actually worked with multiple comparable products in similar use cases.