Agreed. The numbers in the OP are way off and actually I think your numbers are fairly aggressive also. Most of the charts you see online are based on the playing surface size + 2x 58" cue size, which is clever marketing but leaves no margin for stroke and stance, when the CB is right on the rail. I think using 64" (6" margin on the 58" typical cue) as the standard - is whats required to have a truly comfy table that won't need kid cues and won't have you jammed up against walls and furniture. I consider 19' x 14'8 to be the minimum true size needed to comfortably house a 9' table. Thats derived from 100+64+64 & 50+64+64. For casual recreational play, shorties aren't that big a deal and anyone can make their own decisions how much cramping they can tolerate for their own home situation, but basing the core sizing around a 58" cue with no additional margins - is pretty silly IMO.
As for playability of an 8 ft vs 9, etc, I'll be a bit of a dissenter here. I play almost exclusively on 9 and 7 ft tables, but my buddy has a small poolhall with 8 ft tables and when I've visited him and played on them for a few days at a time, I've made a clear observation about 8ball. I haven't played a ton of 8 ft tables, but there is also one bar near me that has an 8ft valley barbox that I've played on a few times and same seems true on it. So my view is this - 8 ft tables are sort of "optimal" for the game of 8ball, it seems much easier a game vs playing on both 9ft and 7ft barboxes. My personal largest packages in 8b were done several times on 8ft tables. My theory for why this is, is that 8' tables have much less clustering than barboxes, but also don't have the longer shot making distances of 9 ft tables. Most 8 ft tables also tend to have generous sized pockets compared to most 9 ft tables. So in reality playing 8b on an 8ft table is sort of like taking the easier aspects of a barbox play minus the major challenge of barbox 8ball (clusters) - thus making it the easiest of the 3 sizes. I'm not much of a 14.1 guy, but I imagine the issues might be similar there also.
For what it's worth, I also have a tight difficult 9ft table at home and no casual player really enjoys playing on it, and I get annoyed by it also at times. For a general purpose social home table an 8ft with generous pockets is obviously going to be the most comfy and fun choice for anyone except the more serious player crowd. No perfect answer, can't please all the folks all the time...
Just some thoughts...