Frustrating interview experience that lasted months.

Was interviewing for a B2B SaaS which would've been a great company to join. Started speaking to them in December. Went through 5 rounds of interview, the last one with the founder. Ended up rejecting me because of my past work experience not being the best fit for what they want. This was such an incredibly frustrating experience. They checked my skill set with an assignment and product solutionising round, and yet relied on past experience to filter me out after being in conversation for months. Only thing for me to learn here is to never let your guard down, always be wary that you can be rejected at any point. Your skills, even if tested, matter only to the extent that you can combine it with telling them what they want to hear. That said, anyone looking for a product manager? :) Have ~2 years of experience as a PM (3+ overall).