I think some are a little confused with the signings Spurs have made and our "intent".
What I think the real debate is stemming from is the difference in philosophies between the two clubs.
Man United are in a position where they have to re-solidify their status as a top club at almost all costs after 3 poor years. Spurs are in a position where they're looking to build the infrastructure (training ground, stadium, style of play, scouting, etc.) and grow steadily and organically. United fans are therefore looking at signings who will go into the first 11 as a measuring stick. Spurs fans have to wait until the season progresses to see how the young players develop and how the "depth" signings contribute as the measuring stick.
For example United are signing Ibrahimovic in an attempt to improve the starting 11, but it will push young players like Rashford to the bench. Spurs on the other hand are looking to continue playing and developing their young under 25 players like Kane, Dier, Alli, Eriksen, Lamela, etc. and therefore don't want to make signings that push them to the bench so they can rot, and will therefore take the lumps of having a less experienced side. They simply want to bring in some further young players to push them and hopefully uncover another gem. The Spur's veterans are hard to improve upon, they had the tied best defense with Lloris, Rose, Vertonghen, Alderweireld, and Walker contributing extremely well and Dembele had one of the best seasons for a midfielder in the entire league.
The fact is Spurs starting 11 had a fantastic season. Best GD in the league, tied best goals against, second best goals for, most shots on target, least shots conceded, etc. improving upon that with an obvious "world class" signing would require money that we simply do not have to spend. That said we've consistently brought in players like Alli or players up through the academy to contribute in ways no one expected.