I'm a contractor and always push back. The person who will have trouble understanding the code and delivering features isn't someone down the line, it's me in

I'm a contractor and always push back. The person who will have trouble understanding the code and delivering features isn't someone down the line, it's me in just a couple of weeks time. The only way I can deliver consistently is to fix things as I go. To be fair, I've had contracts finish early because of taking this approach. Most contracts are not just 1 week, but for months. If I just bash out any old shit then not only will the next dev be cursing me but I won't get any better along the way. If you don't do a good job, then why bother at all? Maybe you should try contracting, if you don't like it or there is bad office politics you always know you will be somewhere else in a matter of months.