Large flagship tablets are often used for media, drawing, and productivity, but they're still constrained by battery aging and screen vulnerability. Common failures include cracked OLED glass, charging-port wear, and battery decline (especially with heavy brightness and fast charging.
If your Tab is relatively new and only needs a battery service or port repair, it can be worth keeping-these devices remain capable for years. If the screen is damaged (especially with touch/pen issues) and you also have charging problems, repair costs can quickly exceed the threshold.
Consider replacement sooner if you depend on it daily and repair turnaround would disrupt work. Price is set to the typical MSRP range for the S9 Ultra; retailer discounts and storage options can change replacement cost.