YES!
I consider this a critical Data Integrity feature, not just a “nice to have”. A text search is only reliable if the text we enter is consistent. Misspellings mean missed items in filters and searches. I currently have a sticky “E” key and have found several items that slipped through the cracks because I filtered for a specific word but the text of the item was missing an ‘e’.
I do recall Jay saying there were technical obstacles but I’d love for him revisit the question (and let us know) in case anything has changed. Integrated spellcheck is in seemingly everything now, it’s a little hard to accept that it’s not possible. Maybe a Grammarly integration as hickeybrennan mentions? Even if it takes some trouble on the user’s part to set up, it’d be worthwhile.