My filco with browns that arrived in the mail today does have a slight tactile bump, but it's barely noticeable. I didn't notice it at all when I first tried it.
It took me a week or two to feel the tactile bump on my filco with browns (at all). I had never tried them before buying that board. It was not until I got another brown board for work that I stopped bottoming out the keys (most of the time.) Now I can always feel the bump.
The bump is cased by friction against a tab, so its entirely understandable that they would not last as long as BS keyboard. Try working out the calculations though. Its not hard to realise Just how long a 20mil actuation key will last
If you pressed a key once per second for 8 hours a day, for 1 year, you would only reach 10,512,000 actuations. So, you would still get another year of use out of it. That example is ridiculous though. I would bet that the max that even a secretary would type would be three or four hours per day of continuous, full speed typing. And even then, you would need to determine the most used single key, and the frequency that it is used at average typing speed.
In the end, your cherry switch (tactile or not) may not last as long a Buckling Spring. But you can rest assured that they will last a VERY LONG time.