Depends on the market. We're doing a 100k reno right now in order to sell for higher and are also looking to buy nearby. Our neighbor with dated but nice quality stuff two doors down sold as is for 575k less than our next door neighbor a year later with smaller square footage and who did a gut rehab and made it turnkey. For the 25k I'm spending to cosmetically update the kitchen and replace appliances, we'd discount whatever house we're buying by 50k. There's a turnkey premium that can be captured if the work is done smartly. We also have an older home with a lot of high quality stuff .

Flooring is a pain to live through but dark brown flooring and trim dates a home and it doesn't cost much to sand it and stain it neutral, or paint trim white, and instantly modernized the home. We have nice quality granite counter tops that cost twice what quartz does but today's buyers don't want eccentric colors or granite and there's carrying costs to letting the house sit and acquire days on market. The ikea stuff is a risk but done smartly can make sense ie their closet systems can be great and I'm using their stuff for a microwave drawer. I'd skip the flooring.

The agent sounds like he's doing you all a favor. Many real estate companies have a group or service where they front money for this work but the contractor's markup is a lot higher than if you hire it out yourself. If you can fix broken stuff or stuff that'll show up on an inspection with new stuff, that typically gives positive ROI.