@ckissi You have only heard from three forum members and there doesn’t seem like a lot of movement on the forum, which is understandable at this time of year. It might well be that others would welcome what you are suggesting, but I think @Bill is 100% right when he says there would likely be a lot of support requests.
If you planned on making this free I would make it absolutely clear this is supplied “as is” without guarantees. Should you decide to make it a commercial product I think it would require heavy marketing to a much wider audience and you could expect endless feature requests, unless you make it a $2 app.
Personally, I find FTP clients that simply upload are not sufficient, because there are times when you also need to delete or rename things, then at other times I copy items from one FTP sever to another. There are free options out there like Cyberduck, yet a good number evidently purchase software like Transmit or Forklift for the additional features and flexibility.
On the question of servers, it’s staggering how much traffic can be handled by a low end VPS if you have static html sites like Blocs produces, though in some instance websites will actually be faster on shared hosting. I had an unmanaged 1 gig VPS with Hetzner about 8 years ago that cost €12.90 a month without cPanel and they must be cramming in huge numbers of users at €2.98 a month with throttled resources I would guess.
Since then I had a more powerful managed VPS at Futurehosting that was fine, but it was costing me too much. The problem I’ve always found with shared hosting plans is reliability with unexpected slow downs or downtime, despite all the claims they make. The recent move to cloud hosting, following a suggestion from another forum member is looking good so far, but I was still awake at 2.00am on the first night struggling with FTP error messages about missing directories that made no sense.