I usually think it´s easier to cugt the legs than to lengthen them.
True, but getting all of the legs the same height can be a real pain, unless you put some sort of leveling device on the bottoms.
I sit while using my router table, so it's lower than most. I didn't try to go by any 'guidelines' when I made it tho, just picked a height that I felt comfortable with. I know it's a bit above my elbows. It's worked out quite well for me.
I am extending one side of my table, attaching an already made seat/bench to it. Legs need extending, so clamping one end on the router table, that end has two legs. Once I get the other end lifted some, I'll adjust the heights to match, then drill thru the table and bench, and put a few bolts thru to secure it. Then on the other end of the bench, one leg here, I'll raise that until it is level with the table, reclamp, drill some holes, and bolt on an extension for the leg. Simple does the job. The only really difficult part will be getting down, and back up, my joints and back are going to really kill me on this one.
"It ain't what you're told, it's what you know." - Granny Weatherwax
Gather the villagers, pitchforks, torches; we march at dusk!
Some days, the supply of available curse words is insufficient to meet my demands.
.....Call me a craftsman, artisan, or artistic, and I will accept that. Call me an artist and you will likely get a quite rude comment in return. I am not a @#$%ing artist.