As a powerlifter, I completely agree with the OP. When I first got into resistance training, as a techie, my inclination was to try all the apps and gadgets. 3 years later and I realised that the old timers had it right, the best tool for resistance training is a pencil and a notebook, maybe backed up by a spreadsheet to track long-term progress.
1. As a consumer, I would like to have such an editor / viewer for my phone, is there something alike for traindown?
2. Functionality-wise, wouldn't a nice editor/viewer app necessarily be a subset of spreadsheet-like app and isn't traindown then competing against such a more general app? (Not that I know a single FOSS spreadsheet app, so I'm speaking hypothetically)
I think the issue here is that you never really stuck to a single app and used it long term. I was in the same boat, I pretty much tried all the apps, bought an Apple Watch, but nothing really satisfied my needs. In the end, I just stuck to one app (Strong), and kept using it. It's not perfect, and there are things that I'm missing, but in the end, it always me to track all my lifts and shows me the progression. It's indeed something that I could quite easily do with a notebook (although I won't have the fancy graphs), but I already have my phone with me to listen to music, so might as well use it to track.
Along with rough tracking of calories -- I ignore things like green veggies and coffee -- and weight and I'm golden.
For me, Strava is more about tracking my individual runs and keeping up to date with what friends are doing. Monitoring any actual training, for me at least, is easier with paper and a spreadsheet.
There's also a number of things you can do with an old Android smartphone and some common apps that create GPX format track files, if you want to import your ride paths into Google Earth pro on a desktop PC, without uploading to a cloud based service.
You don't need some $400 bike computer and a cloud based service to achieve a high level of road cycling fitness. Have a good digital scale at home. Track your cumulative riding distances and average speeds. Eat healthy, etc.
Having an offline log and metrics to compare your own performance against is extremely useful. Data and information can be a powerful motivator to compete against yourself to improve your average speeds, climbing times and so forth. Where I disagree philosophically is whether that data needs to become a subscription you pay forever for, or if your data needs to ever go out to a third party.
And I really disagree. Maybe one doesn't need a good cycle computer, but the stats and motivation that brings is invaluable. Seeing the actual data instead of just an average/total at the end is very useful.
I used to track my hiking miles back in the day. All it did was justify poor eating habits or give me a false sense of pride.
This is useful for those who don't find working out in itself to be a rewarding activity and may have a hard time sticking with it otherwise.
I'm just interested in being fit (which I achieve with just shoes, and going for a run every ~3 days), not in achieving peak fitness or optimal training strategies.
I believe others benefit from tracking, which is fine too.
Doesn't align with my experiences, at all. Every single runner and cyclist I know (including myself) uses apps to track their activities. Notebooks are simply not as convenient as automatic GPS tracking. I understand why notebooks are sufficient for lifting, which has long rest periods to record relatively simple measurements. But it's a different story for lots of other sports.
Strava alone has something like 50 million users, and for good reason - it's an incredibly effective training tool.