Bear in mind that the screen is only 800p, so I think the CPU and the GPU might be good enough to play 9th gen games games at low settings at 720p or 800p, and if not, there is always AMD's Super Resolution, which will allow you to run at an even lower and less demanding resolution like 540p and then upscale to match the 800p screen. Docked is where it will struggle, 9th gen games running at such low resolution won't look great on a big 4K tv, even with AMD Super Resolution.
As for the storage, the base model probably will struggle on 9th gen games, in terms of both size and speed, so I would definitely recommend getting the mid-range model with the 256 GB NVMe SSD if you want to use this to play 9th gen games.
Sadly, 4 cores / 8 threads is a real problem. Tuning resolution or graphics settings don't solve the issues, the future games will quickly ask for 6 cores / 12 threads.
Oh welp, playing indie games is the best to go. And for the storage... ohhh.. We need NVMe SSD slot 2 internally, because my Steam games are heavier than my digital Switch games. xD