If you want a sofa that will last a lifetime, buy one from Knoll and you can get it reupholstered 20 years from now:
https://www.knoll.com/shop/living-room/sofas
https://www.thayercoggin.com/milo-baughman-gallery
https://vicadesign.com (made to order)
If you're in the market for buy-it-for-life solid wood furniture:
https://vermontwoodsstudios.com/
https://hedgehousefurniture.com
https://www.57thstreetbookcase.com/ (all bookcases, some veneer and plywood)
https://www.spekeklein.com/home
https://roomandboard.com (mix of solid and veneer, some MDF)
These makers are in a league of their own, very expensive, incredibly beautiful hand-made pieces:
https://www.sammaloofwoodworker.com
https://www.thosmoser.com (highly recommended)
https://nakashimawoodworkers.com (new commissions around $7K-$15K for a coffee table, $20K-40K for dining table, plus shipping; older Nakashima pieces are highly valued in the art world and sell anywhere between $15K-$300K)
And as a reminder: your local woodworker can build all sorts of furniture, with and without upholstery. You can also find all sorts of antique and vintage pieces online (modern, unfinished, or restored) and at local second-hand furniture stores.
If you're getting upholstered pieces (or need to custom order fabric) opt for natural materials, particularly linen and wool. Or quality leather! They'll last much longer synthetic blends:
https://mclaurinandpiercy.com/
https://www.knoll.com/shop/knolltextiles/upholstery/all-upho...
https://www.hollyhunt.com/products/textiles/upholstery
https://www.maharam.com/products/upholstery/search
https://www.spinneybeck.com/products/category/upholstery-lea...
https://www.edelmanleather.com/products/upholstery-leather/d...