Nothing is wrong with them if 1) you have a specifically suited, niche problem and you understand the complexities and tradeoffs of the tool OR 2) it's not a cr

Nothing is wrong with them if 1) you have a specifically suited, niche problem and you understand the complexities and tradeoffs of the tool OR 2) it's not a critical requirement to solve the problem using modern, efficient tools AND you want to use something else for fun or learning or whatever. If this isn't the case, stay away.