There should be a big for a business stuck on there. The primary reasons are loss of quality, practically by definition new code is less well tested than old c

There should be a big for a business stuck on there. The primary reasons are loss of quality, practically by definition new code is less well tested than old code; loss of time, in the rewrite you spend time re-implementing features your system already had which doesn't provide new value for end users(it is hard to sell an upgrade of no new features.)