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For clarification, you will find out if a brush is floppy or not when you wet it, and especially after some time when it breaks in.

That statement shows that you should do some research.
Thater, Shavemac, Simpsons, Vie Long, Varlet, Wiborg, all make their own knots in house.
Get 10 That er knots of the same size and they...

Where is the fun in that?
For me cheap brushes basically are not worth looking at with rare exceptions when a particular knot is made well actually.
I decided I am going all in on higher brushes...

Silver tip (3 band) knots are the floppiest thing you will ever see. The only option to get some backbone from them is to set them deep. Simpsons makes a top notch Silver Tip (they call it Super...