Really, it's not that big of an issue as long as you purchased enough space for yourself.
You can still make this SSD last 10+ years. The way you use the device will just have to change.
Use it like this.
If you have 200 GB of stuff you want to put on it you need at least 400 GB or the 512 GB option (480).
You then put your 200 GB of stuff on the drive and then THANKFULLY because the OS is stable, you just have your macOS install on the internal drive with your apps, and you won't or shouldn't have to re-install your OS like 15 times that would be STUPID. Your OS is installed and updated like 5 times a year so that's about 50 times you have to scramble your data with an update. And if you have the extra "Double Amount" TRIM Support will help you survive, as long as you have the extra 200 GB of space.
But if you do heavy video, audio, photo work, you better invest in an External Type-C drive to store your WORK data, which thankfully to Thunderbolt 3 will be lightning fast.
So as long as your STABLE OS is there updated at most 50 times, with the Apps getting their updates, and you have minimal writes to your SSD, WITH the EXTRA double space, for TRIM support you will be FINE.
But if you have a 256 GB and you max it out with the 200 GB and you write some video files with audio files quite a bit on the internal SSD you would probably get around 3-5 years...
OTHERWISE 2015...