Yes I'd buy one, but only for under £200. 4GB is fine for older games and Indie's (which is what I play most of), and by "older games" I don't mean "relegated to 90's / 2000's", but as a reality check - Prey (2017) uses 3.5GB, The Talos Principle (2015) uses 3.2GB, Supraland (2019) uses 2.6GB, and many "Overwhelmingly Positive" games I've played recently like (off the top of my head) Shadow Tactics Blades of the Shogun (2016), The Pedestrian (2020), Lair of the Clockwork God (2020), Neverwinter Nights EE (2018), Dusk (2018), etc, are well under 2GB, as are the bulk of pre 2014 games (Bioshock 1-3, Dishonored, Deus Ex:HR are under 1.5GB, Oblivion is 0.7GB, Morrowind is 0.5GB, etc). Many games will in fact still remain under 4GB even with a mild resolution increase to 2560x1080 (budget 29" Ultrawide), or even 1440p for old titles. There's also this other feature called "common sense" where if a game needs 4.3GB Ultra but only 3.7GB High, then just turn it down a notch. Again hardly perceivable in many games outside of static screenshot comparisons.
Given absurd GPU availability in many regions, it also has value as a backup. If you have an iGPU-less CPU and if your main GPU dies, you'll be more far grateful for the ability to play 90-95% of your collection vs having no usable PC at all than worrying about the 5-10% you can't if this ends up one of the better available GPU's you can get precisely because 4GB isn't enough for mining Ethereum. This is one reason why I'm keeping my GTX 1650 Super as a backup (which I was happy to pay £149 for). I've been tempted several times to sell it given ridiculous prices people are paying (up to £350 on Ebay at one point), but my CPU has no iGPU and I'm taking no chances at all as I refuse to pay "scalper prices" for anything.