Yea, I've heard switch testers are hit and miss, and dont really accurately give you a good idea of what a switch will feel like on a board. My goal in getting one is to get a better idea of what my hands can handle. I'm going to write a longer post on R/MK about this, but before I bought my first board, I had my eye on the same board I ended up buying but in mx green. I loved the idea of a heavy, clicky switch. However, after watching many videos and reading many reviews, and after taking into account that I am a touch typist with small hands and relatively light fingers, I was too scared to risk it, and hesitant to spend even MORE money on an item I didnt even need that much and I didnt know if I was going to like (the green board was about $30 more expensive than the blue). I didn't get a switch tester because I figured it was an extra expense on top of what was already a pretty expensive purchase. In short, i played it pretty safe.
Now that I know I like mechanicals, I want to get an idea of how heavy the other switches are. Like, can I actuate a 60gram + switch with just my pinky at an angle? Stuff like that. I've read the clears in particular have a completely different feeling on a board than they do on a switch tester, so I'm not judging the feel of the switch so much as the weight. This is an experiment in what my fingers can handle. I also want to do the post because I read a ton of reviews and posts online and most of them were from enthusiasts who loved switches like black/green/clear for their weight but were self-described "heavy typists" or from gamers who wanted a light switch for gaming purposes. I type a lot and wanted a board that was fun to type on but that wouldn't fatigue me. Also, unlike many enthusiasts, I bottom-out on each keystroke and have no intention of learning not to.