Inter are moving on the transfer market in a 'Masterful' way
I'd say Inter are (somewhat) in the same boat Juve were in a decade ago. Back then, they had a core of Buffon, Bonucci & Chiellini. They'd reached the CL Final twice (2015, 2017), and lost both times.
Rather than being smart & pragmatic, they decided to invest to make sure their 'senators' would get the proper 'send-off' they deserved. They spend a 100m for C. Ronaldo; thus blowing up their wage structure, and leveraging future spending to try and get over the hump.
They didn't another final. Covid meant they were financially hamstrung for a long time.
Inter are in a very similar situation. They have a core (Nico, Marcus, Lautaro, Hakan, Dimarco) who're all 29+. They've all been here 5+ years (with the exception of Marcus). They've also lost the Final twice (2023 & 2025). Very similar situations, I'd say.
However, Inter, the last few years, have been working to get a nice core of youngsters too. They spend 15m for Sucic in Jan., because they felt he could contribute right away, was undervalued, and would become prohibitive if they waited. When Napoli offered 40m for Pio, their youth member who'd never played in Serie A before, they had the confidence to refuse. They chose to spend 13m (net) to develop Alex, ensuring he's worthy of Inter (& his father's number).
This summer, Inter could've invested in buying more youngsters; making sure the senators keep their cycle going while the current crop develops to start a new cycle in 3-4 years. They tried this (Palestra, Anan) but didn't succeed. They could've chosen to splurge on a 'flash' signing (Cancelo, Rodri, Rube Dias etc.) who'd also address their team requirements well. How much they'd have succeeded (Cancelo chose Barca over them in Jan.) is a question mark! I'm sure they must've been tempted to send this current group of senators off in style.
In face of failure to get in one of the two boats, what they're doing is what's impressive. Stones for free (on reasonable wages) is a better signing that Dias for 60-80m. He replaces the experience lost (DV & Acerbi). Between Spence & Jones (potentially, hopefully), they'll tie the two cycles together. At 25-27, they form the new core (together with Basto), while still having the 'senators' in their prime.
Almost all the other competitors (Napoli, Milan, Atalanta, Bologna) have new coaches. Juve have a lot of new faces to offer certainties. Only Roma & Como offer some form of continuance. Depending on how others move (in future), Inter, between their 'senators' (29+), the 'current core' (25-27) and the 'kids (~23), could rule Serie A for a long time.