Mistakes can be fixed if they are small scale i.e. one bad hire stand out at a small company and can be fired much more easily. What you're missing is that for these small companies they are excluding the best candidates with this process. In terms of bad hires at large companies they are harder to notice and large companies have more process that tends to make firing people harder.
This is why these big companies do it, because it is actually quite hard to be fired from someplace like google whereas at these small companies you'll be working directly with the owners.
Also people will do all these take home tests and 5 rounds of algo interviews and CCAT tests ... etc for large well known companies as it is prestigious to work for them. They literally won't do them for small companies. For small companies unknown companies all you'll get is desperate people you are actually filtering out all the decent candidates. I went through this process last year it's very hard to hire as a small unknown company.
This is why these big companies do it, because it is actually quite hard to be fired from someplace like google whereas at these small companies you'll be working directly with the owners.
Also people will do all these take home tests and 5 rounds of algo interviews and CCAT tests ... etc for large well known companies as it is prestigious to work for them. They literally won't do them for small companies. For small companies unknown companies all you'll get is desperate people you are actually filtering out all the decent candidates. I went through this process last year it's very hard to hire as a small unknown company.