I never go longer than 48 hours without shaving. Ever. I have tough stubble that grows very quickly, but since I never let it grow for long, I never have to worry about having an aggressive shaver to mow down 4 days of stubble, or whatever. For every shave since September of 2019, I have used a shavette anyway, which can mow down any amount of stubble equally well, so for me it doesn't really matter, but I can see how a Tech might not be the first choice for a person with a lot of facial hair who only wants to shave once a week. Even that is not a problem with the tool itself, it's the tool being used inappropriately.I keep seeing people saying that it takes a lot more skill to get a BBS with a super mild razor than a very aggressive razor and I think that's partly true, but not entirely. That's not always the case and it depends on a huge variety of factors like face and skin type and probably others as well. I have a tough whiskers and very dense beard and while I can get BBS with my Tech razor, it's nowhere as fast or as enjoyable as with some of my more efficient razors, especially if I haven't shaved in 3+ days.
I've been a DE shaver for 6 years now and my first DE razor was a British Tech from the 70s and I know that's not much, but i've tried over 20 razors so far and I keep learning new stuff and I can safely say that when I pick a blade that work for me, get a nice prep with cold water and use Arko for instance, I can get BBS with pretty much any razor regardless how mild, inefficient, aggressive or efficient is even if I try it for the first time without getting irritation, cuts, nicks, weepers, creepers or whatever like 95% of the time.
But that doesn't mean that all razors shave the same or that I can achieve the BBS as easy or as fast. For those with softer whiskers and not so dense it might not matter that much what type of razor they use if they are skilled enough, but that definitely affects those with though whiskers and very dense beards. For instance, even when I get a BBS and my skin is as smooth as glass, I can still see small dots on my face, which are impossible to remove no matter how many times I try, while others have absolutely nothing when they get BBS and that's one of the reasons why I think my beard is a bit different than most people.